The Book of Virtue, Good Manners and Joining of the Ties of Relationship (Kitab Al-Birr was-Salat-I-wa'l-Adab)

Muslim :: Book 32 : Hadith 6295

Abu Huraira reported Allah's Messenger (may peace be upon him) as saying: I have held covenant with Thee which Thou wouldst not break, so for any believer whom I curse or beat, make that an expiation on the Day of Resurrection.