Sunan an-Nasai Book 26, Hadith 3324

أَخْبَرَنَا يُونُسُ بْنُ عَبْدِ الأَعْلَى، قَالَ أَنْبَأَنَا ابْنُ وَهْبٍ، قَالَ أَخْبَرَنِي يُونُسُ، وَمَالِكٌ، عَنِ ابْنِ شِهَابٍ، عَنْ عُرْوَةَ، قَالَ أَبَى سَائِرُ أَزْوَاجِ النَّبِيِّ صلى الله عليه وسلم أَنْ يَدْخُلَ عَلَيْهِنَّ بِتِلْكَ الرَّضْعَةِ أَحَدٌ مِنَ النَّاسِ - يُرِيدُ رَضَاعَةَ الْكَبِيرِ - وَقُلْنَ لِعَائِشَةَ وَاللَّهِ مَا نُرَى الَّذِي أَمَرَ رَسُولُ اللَّهِ صلى الله عليه وسلم سَهْلَةَ بِنْتَ سُهَيْلٍ إِلاَّ رُخْصَةً فِي رَضَاعَةِ سَالِمٍ وَحْدَهُ مِنْ رَسُولِ اللَّهِ صلى الله عليه وسلم وَاللَّهِ لاَ يَدْخُلُ عَلَيْنَا أَحَدٌ بِهَذِهِ الرَّضْعَةِ وَلاَ يَرَانَا ‏.‏

It was narrated that 'Urwah said:"The rest of the wives of the Prophet refused for anyone to enter upon them on the basis of that type of breast-feeding, meaning breast-feeding of an adult. They said to 'Aishah: 'By Allah, we think that what the Messenger of Allah told Sahlah bint Suhail to do was a concession which was granted by the Messenger of Allah only with regard to breast-feeding Salim. By Allah, no one will enter upon us, nor see us on the basis of this type of breast-feeding