al-Fadl bin Dakayn, Abu Na'eem الفضل بن دكين أبو نعيم الملائي · The Book of Marriage

"A man of the Ansar came to the Messenger of Allah and said: 'I have married a woman.' He said: 'Did you look at her? For there is something in the eyes of the Ansar.'"

"The rest of the wives of the Prophet refused for anyone to enter upon them on the basis of that type of breast-feeding, meaning breast-feeding of an adult. They said to 'Aishah: 'By Allah, we think that this is a concession which the Messenger of Allah granted only to Salim. No one will enter upon us, nor see us on the basis of this type of breast-feeding.'"

It was narrated from Ibn 'Umar that the Messenger of Allah forbade Ash-Shighar. Ash-Shighar means when a man marries his daughter to another man, on the condition that that man marries his daughter to him, and no dowry is exchanged between them.