The Book of Pilgrimage (Kitab Al-Hajj)

Muslim :: Book 7 : Hadith 2821

Ghunaim b. Qais said: I asked Sa'd b. Abu Waqqas (Allah be pleased with him) about Mut'a, whereupon he said: We did that, and it was the day when he was an unbeliever living in (one of the) houses of Mecca.

Source materials are from the University of Southern California MSA site
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