Muwatta Imam Malik (Riwayat Yahya)

It is narrated from Hazrat Abu Idris Khawlani (he says): I went to the mosque of Damascus, where I saw a young man with white teeth. Whenever the people around him differed in any matter, they would hold fast to what he said and rely upon his statement. I asked, "Who is this young man?" The people said: "This is Sayyiduna Mu'adh bin Jabal (may Allah be pleased with him)." The next day, I went very early and saw that he had arrived before me and was praying. I waited, and when he finished his prayer, I came before him and greeted him with salam. Then I said: "I love you for the sake of Allah, the Glorious and Exalted." He said: "For the sake of Allah?" I said: "Yes, for the sake of Allah." He asked again: "For the sake of Allah?" I said: "Yes, for the sake of Allah." He asked a third time: "For the sake of Allah?" I said: "Yes, for the sake of Allah." Then he took hold of the edge of my cloak, pulled me towards him, and said: "Rejoice! I heard the Messenger of Allah (peace and blessings be upon him) say: 'Allah, the Glorious and Exalted, says: My love becomes obligatory for those who love one another for My sake, who sit together for My sake (to remember Allah or to teach religious knowledge), who spend their lives and wealth for My sake, and who visit one another for My sake.'"