One of the fundamental beliefs of Ahlus Sunnah wal Jama`ah that at times distinguishes them from heretics is their belief in the Companions of the Prophet (s.a.w.) and all that has been mentioned about their virtues, merits and characteristics in the Qur'an and Sunnah.
Companions are all those who met the Prophet (s.a.w.) and died as Muslims. Scholars have said that they were 114,000 in number [as stated by Abu Zur'ah, the teacher of Imam Muslim, and recorded by as-Suyootee]. They are praised in many Qur'anic verses: "You are the best of peoples ever raised for mankind, you enjoin good and forbid evil, and you believe in Allah." [3:110] "And the first to embrace Islam of the Muhajiroon (the Emigrants from Makkah) and the Ansar (the citizens of Al-Madeenah who helped the Muhajiroon) and also those who followed them exactly (in Faith). Allah is well-pleased with them as they are well pleased with Him. He has prepared for them Gardens under which rivers flow, to dwell therein forever. That is the supreme success." [9:100] "Indeed, Allah was pleased with the believers when they gave their pledge to you (O Muhammad) under the tree. He knew what was in their hearts and He sent down calmness and tranquility upon them..." [48:18]
Our Attitude Towards Them
Our attitude towards the Sahaba should be that of love, respect, peace and purity of our hearts and tongues. Allah has described this in His saying: "And those who come after them say: 'Our Lord! Forgive us and our brethren who have preceded us in Faith, and put not in our hearts any hatred against those who have believed.'" [59:10] And the Prophet (s.a.w.) said, "The sign of faith is love of the Ansar and the sign of hypocrisy is the hatred of Ansar" [al-Bukharee, Muslim]. Why should we not be thankful to those who believed in the Prophet, assisted him, strove with their lives and wealth to make the Word of Allah supreme, preserved and transmitted to us our Religion? Who is more deserving that we pray for them and speak of them in the best manner and think of them with the best thoughts?
From:
https://www.kalamullah.com/aqeedah15.html