that the Messenger of Allah (ﷺ) said: "'Ali is from me and I am from 'Ali. And none should represent me except myself or 'Ali."
Jami` at-Tirmidhi Book 49, Hadith 116
← Previous Hadith that the Messenger of Allah (ﷺ) said: "Indeed Allah has ordered me to love four, and He informed me that He loves them." It was said: "O Messenger of Allah! Name them for us." He said: "'Ali is among them," saying that three times, "And Abu Dharr, Al-Miqdad, and Salman. And He ordered me to love them, and He informed me that He loves them."

Jami` at-Tirmidhi Book 49, Hadith 115 Next Hadith → that the Messenger of Allah (ﷺ) made bonds of brotherhood among his Companions. So 'Ali came crying saying: "O Messenger of Allah! You have made a bond of brotherhood among your Companions, but you have not made a bond of brotherhood with me and anyone." So the Messenger of Allah (ﷺ) said to him: "I am your brother, in this life and the next."

Jami` at-Tirmidhi Book 49, Hadith 117