Sahih Muslim Book 009, Hadith Number 3575.
Chapter: Li'an (Invoking curse).
This hadith has been narrated on the authority of Zuhri with the same chain of transmitters. In the hadith transmitted on the authority of Ma'mar, the (words are): "Messenger of Allah, my wife has given birth to a dark-complexioned boy, and he at that time was intending to disown him." And this addition has been made at the end of the hadith: "He (the Holy Prophet) did not permit him to disown him."