Ibn ‘Umar told that Ghailan b. Salama ath-Thaqafi accepted Islam and that he had had ten wives in the pre-Islamic period who accepted Islam along with him; so the Prophet told him to keep four and separate from the rest of them.
When I was sitting with the Prophet a woman came forward and the Prophet spread out his cloak and she sat on it. Then when she went away someone said that this woman had suckled the Prophet.
When I accepted Islam I had five wives, so I consulted the Prophet and he said, “Separate from one and keep four.” I therefore decided on the one who had been longest with me and had been barren for sixty years,* and separated from her.
* This statement may seem strange when one considers that Naufal is said to have died in the Caliphate of Yazid b. Mu'awiya (60-64 A.H.). Some say he lived 60 years in the pre-Islamic period and 60 years in Islam. Others says he died aged 100. He is said to have accepted Islam at the Conquest of Mecca. The tradition cannot mean that he had been married to this woman for 60 years; it probably indicates that she was both barren and much older than he. She was possibly his first wife. Cf. Ibn Abu Hatim, al-Jarh wat-ta’dil, IV, i, 487 i.; Isti'ab, p. 293 ; Ibn Hajar, Tahdhib, x, 492; Isaba, iii, 1191.
Hajjaj b. Hajjaj al-Aslami quoted his father as saying, “Messenger of God, what will remove from me the obligation due for fostering a child.”* He replied, “A slave or a slave-girl of good quality.”
*It is said that Arabs liked to give a woman who had fostered a child something over and above the hire. This tradition deals with the amount to be considered full compensation for services rendered.
Tirmidhi, Abu Dawud, Nasa’i and Darimi transmitted it.