Hadith 3477
Chapter 45: Denying The Child Through Li'an, And Attributing Him To His Mother - كتاب الطلاق
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 3477
In-book reference : Book 27, Hadith 89