The Book of Marriage (Kitab Al-Nikah)

Muslim :: Book 8 : Hadith 3377

Abu Sa'id al-Khudri (Allah be pleased with him) reported that mention was made of 'azl in the presence of Allah's Apostle (may peace be upon him) whereupon he said: Why do you practise it? They said: There is a man whose wife has to suckle the child, and if that person has a sexual intercourse with her (she may conceive) which he does not like, and there is another person who has a slave-girl and he has a sexual intercourse with her, but he does not like her to have conception so that she may not become Umm Walad, whereupon he (the Holy Prophet) said: There is no harm if you do not do that, for that (the birth of the child) is something pre- ordained. Ibn 'Aun said: I made a mention of this hadith to Hasan, and he said: By Allah, (it seems) as if there is upbraiding in it (for 'azl).

Source materials are from the University of Southern California MSA site
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