The Book of Divorce
27/45. Chapter:
Denying The Child Through Li'an, And Attributing Him To His Mother
Sunan an-Nasai
أَخْبَرَنَا قُتَيْبَةُ، قَالَ حَدَّثَنَا مَالِكٌ، عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ، قَالَ لاَعَنَ رَسُولُ اللَّهِ صلى الله عليه وسلم بَيْنَ رَجُلٍ وَامْرَأَتِهِ وَفَرَّقَ بَيْنَهُمَا وَأَلْحَقَ الْوَلَدَ بِالأُمِّ .
It was narrated that Ibn 'Umar said: "The Messenger of Allah conducted the procedure of Li'an between a man and his wife, and he separated them and attributed the child to his mother."
Reference : Sunan an-Nasa'i 3477In-book reference : Book 27, Hadith 89English translation : Vol. 4, Book 27, Hadith 3507