Sahih Muslim Book - 44, Hadith - 6319

حَدَّثَنَا حَسَنٌ الْحُلْوَانِيُّ ، حَدَّثَنَا عَمْرُو بْنُ عَاصِمٍ ، حَدَّثَنَا هَمَّامٌ ، عَنْ إِسْحَاقَ بْنِ عَبْدِ اللهِ ، عَنْ أَنَسٍ ، قَالَ: كَانَ النَّبِيُّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ ، لاَ يَدْخُلُ عَلَى أَحَدٍ مِنَ النِّسَاءِ إِلاَّ عَلَى أَزْوَاجِهِ ، إِلاَّ أُمِّ سُلَيْمٍ ، فَإِنَّهُ كَانَ يَدْخُلُ عَلَيْهَا ، فَقِيلَ لَهُ فِي ذَلِكَ ، فَقَالَ: إِنِّي أَرْحَمُهَا قُتِلَ أَخُوهَا مَعِي.

It was narrated that Anas said: "The Prophet (s.a.w) would not enter upon any women other than his wives except Umm Sulaim. He used to enter upon her and he was asked about that. He said: 'I feel compassion for her because her brother was killed when he was with me."'