Sunan an-Nasa'i 3322
It was narrated that 'Aishah said:
"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.'"
أَخْبَرَنَا حُمَيْدُ بْنُ مَسْعَدَةَ، عَنْ سُفْيَانَ، - وَهُوَ ابْنُ حَبِيبٍ - عَنِ ابْنِ جُرَيْجٍ، عَنِ ابْنِ أَبِي مُلَيْكَةَ، عَنِ الْقَاسِمِ بْنِ مُحَمَّدٍ، عَنْ عَائِشَةَ، قَالَتْ جَاءَتْ سَهْلَةُ إِلَى رَسُولِ اللَّهِ ﷺ فَقَالَتْ يَا رَسُولَ اللَّهِ إِنَّ سَالِمًا يَدْخُلُ عَلَيْنَا وَقَدْ عَقَلَ مَا يَعْقِلُ الرِّجَالُ وَعَلِمَ مَا يَعْلَمُ الرِّجَالُ . قَالَ " أَرْضِعِيهِ تَحْرُمِي عَلَيْهِ بِذَلِكَ " . فَمَكَثْتُ حَوْلاً لاَ أُحَدِّثُ بِهِ وَلَقِيتُ الْقَاسِمَ فَقَالَ حَدِّثْ بِهِ وَلاَ تَهَابُهُ .