Sunan At-Tirmidhi

Narrated Buraidah: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