Have a dig at this;
Truly, ‘Ali is from me and I am from him (inna ʿAlī minnī wa anā minhu), and he is the walī (patron/spiritual master) of every believer after me.
Prophet Muhammad,
(al-Hakim al-Naysaburi, Al-Mustadrak ‘ala’l-Sahihayn, Beirut 2002, 19, No. 4636; Ahmad b. Shu‘ayb al-Nasa’i, Khasa’is Amir al-Mu’minin ‘Ali b. Abi Talib, Tehran 1998, 129)
‘Ali is with the Qurʾān and the Qurʾān is with ‘Ali. They will not separate from each other until they return to me at the [paradisal pool] (al-ḥawḍ).
Prophet Muhammad,
(al-Hakim al-Naysaburi, Al-Mustadrak ‘ala’l-Sahihayn, Beirut 2002, 927, No. 4685)
[To ‘Ali]: Are you not happy that you should have in relation to me the rank of Aaron in relation to Moses, except that there is no prophet after me.
Prophet Muhammad,
(Ahmad b. Shu‘ayb al-Nasa’i, Khasa’is Amir al-Mu’minin ‘Ali b. Abi Talib, Tehran 1998, 76)
Three things were revealed to me regarding ʿAlī: he is the leader of the Muslims, the guide of the pious and chief of the radiantly devout (sayyidu’l-muslimīn, imāmu’l-muttaqīn, wa qāʾidu’l-ghurra’lmuḥajjalīn).
Prophet Muhammad,
(al-Hakim al-Naysaburi, Al-Mustadrak ‘ala’l-Sahihayn, Beirut 2002, 936, No. 4723)
Gazing upon ʿAlī is an act of worship (al-naẓar ilā ʿAlī ʿibāda).))
Prophet Muhammad,
(al-Hakim al-Naysaburi, Al-Mustadrak ‘ala’l-Sahihayn, Beirut 2002, 938, No. 4736)
May God have mercy on ʿAlī. O God, make the truth revolve around ʿAlī wherever he turns (adiri’l-ḥaqq maʿahu ḥaythu dāra)
Prophet Muhammad,
(al-Hakim al-Naysaburi, Al-Mustadrak ‘ala’l-Sahihayn, Beirut 2002, 927, No. 4686)
‘Ali is as my own soul (ka-nafsī).
Prophet Muhammad,
(Ahmad b. Shu‘ayb al-Nasa’i, Khasa’is Amir al-Mu’minin ‘Ali b. Abi Talib, Tehran 1998, 104)
You [‘Ali] are from me and I am from you (anta minnī wa anā minka).
Prophet Muhammad,
(al-Hakim al-Naysaburi, Al-Mustadrak ‘ala’l-Sahihayn, Beirut 2002, 924, No. 4672)
Whoever obeys ʿAli obeys me, and whoever disobeys him disobeys me.
Prophet Muhammad,
(al-Hakim al-Naysaburi, Al-Mustadrak ‘ala’l-Sahihayn, Beirut 2002, 925, No. 4678)
[To ‘Ali]: You will clarify for my community that over which they will differ after me.
Prophet Muhammad,
(al-Hakim al-Naysaburi, Al-Mustadrak ‘ala’l-Sahihayn, Beirut 2002, 926, No. 4678)
There is one amongst you who will fight for the taʿwīl [spiritual interpretation] of the Qurʾān as I have fought for its tanzīl [literal revelation].’ Abū Bakr asked, ‘Is it I?’. The Prophet said, ‘No’. ʿUmar asked, ‘Is it I?’. The Prophet said, ‘No, it is the one who is mending the sandal.’ The Prophet had given ʿAlī his sandal to mend.
Prophet Muhammad,
(al-Hakim al-Naysaburi, Al-Mustadrak ‘ala’l-Sahihayn, Beirut 2002, 926, No. 4679)
O ʿAli, whoever separates himself from me separates himself from God, and whoever separates himself from you, O ʿAli, separates himself from me.
Prophet Muhammad,
(al-Hakim al-Naysaburi, Al-Mustadrak ‘ala’l-Sahihayn, Beirut 2002, 927, No. 4682)
‘Ali is from me and I am from him (ʿAlī minnī wa anā minhu), and nobody can fulfill my duty but myself and ʿAli.
Prophet Muhammad,
(Ahmad b. Shu‘ayb al-Nasa’i, Khasa’is Amir al-Mu’minin ‘Ali b. Abi Talib, Tehran 1998, 106)
He whose mawlā [master] I am, this ʿAlī is his mawla (man kuntu mawlāhu fa-ʿAlī mawlāhu).
Prophet Muhammad,
(Cited in numerous Sunni Muslim Hadith sources listed here)