"Salim has reached the age of manhood, and understands what men understand. He enters upon us, and I think that Abu Hudhaifah is not happy about that." The Prophet said: "Breast-feed him, and you will become unlawful to him." So she breast-fed him, and the displeasure of Abu Hudhaifah disappeared. She came back to him and said: "I breast-fed him and the displeasure of Abu Hudhaifah has disappeared."
Sunan an-Nasa'i Book 26, Hadith 128
← Previous Hadith "Sahlah came to the Messenger of Allah and said: 'O Messenger of Allah, Salim enters upon us and he understands what men understand, and knows what men know.' He said: 'Breast-feed him, and you will become unlawful to him thereby.' (Ibn Abi Mulaikah, one of the narrators said:) For a year I did not narrate this, then I met Al-Qasim and he said: 'Narrate it and do not worry about it.'"

Sunan an-Nasa'i Book 26, Hadith 127 Next Hadith → "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 what the Messenger of Allah told Sahlah bint Suhail to do was a concession which was granted by the Messenger of Allah only with regard to breast-feeding Salim. By Allah, no one will enter upon us, nor see us on the basis of this type of breast-feeding.'"

Sunan an-Nasa'i Book 26, Hadith 129