That is based off of the saying of a Sahabi and not a Hujjah.
Beliefs of Sahaba are Hujjah for Ahlus-sunnah, except when they are countered by the beliefs taught by Prophet(saws) or Jumhoor Sahaba. As I promised, I'll list out some evidences.
Evidence from Quran to follow Sahaba:And whoever acts hostilely to the Messenger after that guidance has become manifest to him,
and follows other than the way of the believers(Sahaba), We will turn him to that to which he has (himself) turned and make him enter hell; and it is an evil resort.(4:115)
And
when it is said to them: Believe as the people(sahaba) believe they say: Shall we believe as the fools believe? Now surely they themselves are the fools, but they do not know.(2:13)
And (as for)
the foremost, the first of the Muhajirs and the Ansars, and those who followed them in goodness, Allah is well pleased with them and they are well pleased with Him, and He has prepared for them gardens beneath which rivers flow, to abide in them for ever; that is the mighty achievement.(9:100).
And they say: Be Jews or Christians, you will be on the right course. Say: Nay! (we follow) the religion of Ibrahim, the Hanif, and he was not one of the polytheists. : Say: We believe in Allah and (in) that which had been revealed to us, and (in) that which was revealed to Ibrahim and Ismail and Ishaq and Yaqoub and the tribes, and (in) that which was given to Musa and Isa, and (in) that which was given to the prophets from their Lord, we do not make any distinction between any of them, and to Him do we submit
. If then they believe as you(Sahaba) believe in Him, they are indeed on the right course, and if they turn back, then they are only in great opposition, so Allah will suffice you against them, and He is the Hearing, the Knowing.(2:135-137).
Evidence from Hadeeth:The Prophet Muhammed (May the Peace and Blessings of Allah be upon him) also said: “Indeed the people of the Book before you split into seventy-two sects. And this nation will split into seventy-three sects, seventy-two are in the Fire and one in Paradise”. And in another narration, “All are in the Fire except one.” It was asked: Who is that one? He replied, “That which I
and my Companions are upon” Related by at-Tirmidhi (5/62) and al-Haakim (1/128). It has been authenticated by al-Haafidh al-Iraaqee in Takhreejul-Ihyaa (3/199) and Sheikh Albani authenticated it in Saheeh at-Tirmizi 2641. He said it’s hasan(good).
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Evidence from the sayings of Salaf:1. Ibn Abbas said to Khawarij in his debate.
أتيتكم من عند صحابة النبي صلى الله عليه وآله وسلم من المهاجرين والأنصار ، لأبلغكم ما يقولون المخبرون بما يقولون فعليهم نزل القرآن ، وهم أعلم بالوحي منكم ،
I came to you from Muhajireen and Ansar,
the companions of the Prophet peace be upon him to convey their message to you. They are the people who know what they say (from Quran and sunnah), The Qur`an was revealed in front of them and they know about the (meaning of) Wahyy (Quran) more than you. [al Musradrak al Hakim no. 2656, al Hakim said: It is authentic upon the conditions of Muslim, ad-Dahabi agreed with him]
2.
وقد ذكر سنيد قال حدثنا معتمر عن سلام بن مسكين عن قتادة قال قال ابن مسعود: من كان منكم متأسيا فليتأس بأصحاب رسول الله صلى الله عليه وسلم فإنهم كانوا أبر هذه الأمة قلوبا، وأعمقها علما، وأقلها تكلفا، وأقومها هديا، وأحسنها حالا، آختارهم الله لصحبة نبيه صلى الله عليه وسلم وإقامة دينه، فاعرفوا لهم فضلهم، واتبعوهم في آثارهم، فإنهم كانوا على الهدى المستقيم.
‘Abd-Allah ibn Mas’ood(ra) said: “Whoever wants to follow an example,
let him follow the example of those who have passed away, the Companions of Muhammad (S). They were the best of this ummah, the purest in heart, the DEEPEST in knowledge, the least in sophistication. They were people whom Allah chose to be the Companions of His Prophet (S) and to convey His religion, so imitate their ways and behaviour, for they were following the Straight Path.” [Tafseer Al-Qurtabi and Sharh as-Sunnah of Al-Baghawi]
3. Similarly we read:
1143 – وحدثنا ابن عبد الحميد قال : حدثنا يعقوب بن إبراهيم الدورقي قال : حدثنا حكام بن سلم الرازي ، عن عمرو بن أبي قيس ، عن عبد ربه قال : كنا عند الحسن في مجلس ، فذكر كلاما ، وذكر أصحاب النبي صلى الله عليه وسلم فقال : « أولئك أصحاب محمد كانوا أبر هذه الأمة قلوبا ، وأعمقها علما ، وأقلها تكلفا ، قوم اختارهم الله عز وجل لصحبة نبيه ، وإقامة دينه ، فتشبهوا بأخلاقهم وطرائقهم ، فإنهم كانوا ورب الكعبة على الهدي المستقيم »
Al-Hasan Al-Basri said:
Those are the companions of Mohammad, best in the heart, DEEPEST in knowledge, without going out of their way. They were chosen by Allah to accompany his prophet, to stabilize the religion,
so follow their manners and ways, for by Allah they were on the straight path.( Al-Sharee’a by Al-Ajurri 1143)
In the first report, Abdullah ibn Masood is telling the Tabaeen, who are the second greatest generation, to follow those who have passed away, that is the companions(sahaba) of Muhammad(saw). Abdullah ibn Masood(ra) was saying this in the time of second best generation(Tabaeen). And he gives some reasons for following the Sahaba, one of which is, “they were DEEPEST in knowledge” – notice here the choice of words, Abdullah Ibn Masood(ra) as well as Hasan Al-Basri(rah) didn’t say, Sahaba had the MOST knowledge, but they said Sahaba had the DEEPEST knowledge; because there were people who came after Sahaba, who might know things which Sahaba may not have known, for example Imam Al-Bukhari knew more ahadeeth than many Sahaba, because he knew of ahadeeth which different Sahaba had, he knew ahadeeth which Umar(ra) had, which Ali(ra) had, which Ibn Abbas(ra) had, which Abu Huraira(ra) had, which Ayesha(ra) had, etc, He was an encyclopaedia of Hadeeth. So Abdullah ibn Masood(ra) and Hasan Al-Basri didn’t say they had the most knowledge, but they said Sahaba had the DEEPEST knowledge.
So even though some of the scholars who came later knew the things which some of the Sahaba didn’t know, however none of the people who came after Sahaba have the depth of knowledge that the Sahaba had, because even though a Sahabi may know only two hundred hadeeth or three hundred hadeeth, but he was there when those ahadeeth were spoken by Prophet Muhammad(saw), He knew the circumstances, He knew why Prophet(saw) said it, He was there, he experienced it first hand, therefore everyone who came after Sahaba is just scratching the surface of knowledge, whereas Sahaba lived that hadeeth, an opportunity that none of the people who came after has, so sahaba had an edge over everyone who came later. This is the reason Abdullah Ibn Masood(ra) advised people to follow the understanding of Sahaba in comparison to those who came after.
4. Imam Ahmed said: "
Do not copy your Deen from anyone of these, but whatever comes from the Prophet (sallallaahu `alaihi wa sallam)
and his Companions, take it; next are their Successors, where a man has a choice."[ Fulaani (p. 113) & Ibn al-Qayyim in I'laam (2/302)] (Taken from Al-Albani's book prayer of prophet(saws)).
5. Abdur-Rahmaan al-Awzaa’ee 157 AH (May Allah have mercy on him) said:
اصبر نفسك على السنة و قف حيث وقف القوم و قل بما قالوا
و كف عما كفوا عنه, واسلك سبيل سلفك الصالح. فانه يسعك ما وسعهم
“Have patience upon the Sunnah, and stop where the people stopped (the Companions may Allah be pleased with them all) and
speak with what they spoke with and hold back from what they held back and travel upon the path of the Salafu’s-Salih, for verily, what sufficed them will suffice you.” [Suyuti, al-Amr bi’l-’Ittibaa wa’n-Nahi ani’l-Ibtidaa].
Similarly, Imaam al-Awzaa’ee – rahimahullaah – said,
“
Knowledge is what comes from the Companions of Muhammad (sal-Allaahu ‘alayhe wa sallam) and that which does not come from a single one of them is not knowledge.” [Jaami Bayaan al-Ilm (2/36)]
6. Ibn Taymiyya said: "Their creed is the religion of Islam which was sent to the world by Allah through the Prophet (Peace be upon him). But the Prophet (Peace be upon him) said, 'My Ummah will get divided into 73 sects and each one will go to Hell save one and that one is the Jama'at.' Also in one Hadith he said, 'They are those people
who will follow this path which I and my Sahaba follow today.' Therefore they have caught hold of Islam unalloyed from every adulteration and these are the people of Ahl as-Sunnah Wa'l Jama'ah. This group includes the truthful, the martyrs and the virtuous; it includes the minarets of guidance, lamps in the darkness and owners of such superiorities and virtues who have been already mentioned. It includes the saints and also those Imams on whose guidance Muslims are unanimous. It is this successful group about which the Prophet (Peace be upon him) has said: 'One group from my Ummah will always remain dominant with truth; the opponents will never be able to harm its members or afflict them up to the Doomsday.'[Aqeedat-il-Wasitiyyah (pg. 154)]
7. Ibn Katheer said:
فأهل الأديان قبلنا اختلفوا فيما بينهم على آراء وملل باطلة ، وكل فرقة منهم تزعم أنهم على شيء ، [ ص: 317 ] وهذه الأمة أيضا اختلفوا فيما بينهم على نحل كلها ضلالة إلا واحدة ، وهم أهل السنة والجماعة ، المتمسكون بكتاب الله وسنة رسول الله صلى الله عليه وسلم ، وبما كان عليه الصدر الأول من الصحابة والتابعين ، وأئمة المسلمين في قديم الدهر وحديثه ،
The followers of the religions before us had differences of opinions and split into false sects, each group claiming to be following the truth. This Ummah too has split into sects, all of which are misguided apart from one, which is Ahlus-Sunnah Wal-Jama`ah, those who adhere to the Book of Allah and the Sunnah of the Messenger of Allah and what was followed by the first generations,
the Companions, their followers, and the Imams of the Muslims of earlier and later times. [Tafsir Ibn Katheer under 30:32]
8. Imam Rabbani Mujaddid Alf Thanni (Radi Allahu anhu)(971AH-1034AH) states in his famous book Maktubaat " The way of Salvation is followance of the Ahl as-Sunnah Wal Jama'ah. May Almighty Allah bestow blessings upon the Ahl as-Sunnah Wal Jama'ah, in their speech, in their actions, laws, for this is the successful group. Besides this, all other groups have become victims of deception. Today, nobody realizes how much these misled groups will be punished, however, on the Day of Judgment this secret will become apparent. Even though at that time this knowledge will be of no benefit to the misled."
"It is compulsory for the wise people to amend their beliefs to be in accordance with the beliefs of the Ahl as-Sunnah Wa Jama'ah because this is the only group which will be saved from the fire of Hell."
None of the Sahaba, the Salaf-e-Saliheen or the pious scholars of Islam followed the new ideas or beliefs. They strictly abstained from the groups who followed these deviated ideas and beliefs. Their beliefs and actions opposed these new ideas and beliefs. All the great scholars of Hadith and the great scholars of Fiqh of the four Schools of thought and their followers, all held the belief of the Ahl as-Sunnah Jama'ah. In addition, all the great pious Muslims and the Sufi Saints of the past and present, followed the way of the Ahl as-Sunnat Wal Jama'ah. Their great literary works stand witness to this fact." Also the believes of Ahl as sunnah are present on this website.
9. As-Suyuti in Sawn al Mantaq wal-Kalam, p.32] By clinging to their way, holding on to their beliefs and understanding them as they did, worshipping Allah in His Oneness, upon the Authentic Sunnah of the Messenger
in the manner of the Companions one is guaranteed success in this life and security from the Fire in the next life. When questioned by his companions about those who will be saved from the Fire, the Messenger replied, "They are those who are upon what I and my companions are upon." [Reported by Tirmidhi from Amr ibn al-'As - Hadith Hasan] All the great scholars from the earliest to the later times have advised clinging to the way and methodology (manhaj) of the Salaf and adherence to it as it is the only means of deliverance.