Chapter 1: The Book of the Sunnah
It was narrated that Sa 'd bin Waqqas said: "Mu 'awiyah came on one of his pilgrimages and Sa 'd entered upon him. They mentioned 'Ali, and Mu 'awiyah criticized him. Sa 'd became angry and said: 'Are you saying this of a man of whom I heard the Messenger of Allah (ﷺ) say: "If I am a person' s close friend, 'Ali is also his close friend." And I heard him say: "You are to me like Harun was to Musa, except that there will be no Prophet after me." And I heard him say: "I will give the banner today to a man who loves Allah and His Messenger."
Sunan Ibn Majah 121