Musannaf Ibn Abi Shaybah 17902 — Breastfeeding: those who said one

Nafi' says: When Sayyidah Aishah (may Allah be pleased with her) wanted that some child should, after growing up, be able to come in to visit her, she would order one of her female relatives to suckle him (so that Sayyidah Aishah (may Allah be pleased with her) would become his foster maternal or paternal aunt). In this regard she ordered (her sister) Umm Kulthum to give Salim (while he was a child) ten sucklings (so that Salim would become Sayyidah Aishah's foster nephew). She gave him three sucklings and then fell ill, so when he grew up he did not come in to her. Likewise, she ordered Fatimah bint Umar to give Asim bin Sa'd, a client (mawla) of theirs, ten sucklings (while he was a child); so she gave him ten sucklings, and he used to come in to her.