The Book of Marriage (Kitab Al-Nikah)
Muslim :: Book 8 : Hadith 3415
Umm al-Fadl reported: A bedouin came to Allah's Apostle (may peace be upon him) when he was in my house and said: Allah's Apostle, I have had a wife and I married another besides her, and my first wife claimed that she had suckled once or twice my newly married wife, thereupon Allah's Apostle (may peace be upon him) said: One suckling or two do not make the (marriage) unlawful.
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