Ibn Shihab (may Allah have mercy on him) narrates from Urwah (may Allah have mercy on him) that the Prophet (peace and blessings be upon him) ordered the wife of Abu Hudhayfah (may Allah be pleased with him): "to suckle Salim (may Allah be pleased with him) five sucklings, and then he will become unlawful (for marriage) to her." She did so, and thereafter she regarded him as a son. Yunus bin Yazid (may Allah have mercy on him) narrated this story from al-Zuhri (may Allah have mercy on him), from Urwah (may Allah have mercy on him), from Aishah and Umm Salamah (may Allah be pleased with them both), and Shu'ayb bin Abi Hamzah (may Allah have mercy on him) and Uqayl bin Khalid (may Allah have mercy on him) narrated it from al-Zuhri (may Allah have mercy on him), from Urwah (may Allah have mercy on him), from Aishah (may Allah be pleased with her).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الرضاع / 15631