Sahih Muslim Book - 3, Hadith - 685

و حَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ حَدَّثَنَا لَيْثٌ ح و حَدَّثَنَا مُحَمَّدُ بْنُ رُمْحٍ قَالَ أَخْبَرَنَا اللَّيْثُ عَنْ ابْنِ شِهَابٍ عَنْ عُرْوَةَ وَعَمْرَةَ بِنْتِ عَبْدِ الرَّحْمَنِ أَنَّ عَائِشَةَ زَوْجَ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَتْ إِنْ كُنْتُ لَأَدْخُلُ الْبَيْتَ لِلْحَاجَةِ وَالْمَرِيضُ فِيهِ فَمَا أَسْأَلُ عَنْهُ إِلَّا وَأَنَا مَارَّةٌ وَإِنْ كَانَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ لَيُدْخِلُ عَلَيَّ رَأْسَهُ وَهُوَ فِي الْمَسْجِدِ فَأُرَجِّلُهُ وَكَانَ لَا يَدْخُلُ الْبَيْتَ إِلَّا لِحَاجَةٍ إِذَا كَانَ مُعْتَكِفًا و قَالَ ابْنُ رُمْحٍ: إِذَا كَانُوا مُعْتَكِفِينَ.

It was narrated from 'Urwah and 'Amrah bint 'Abdur-Rahman that 'Aishah, the wife of the Prophet (s.a.w), said: "I would enter the house for a need (when I was in I'tikaf). and while passing by I would inquire about the health of sick (in the family). And the Messenger of Allah (s.a.w) used to put his head out to me when he was in the Masjid, and I would comb it, and he did not enter the house except for a need when he was in I'tikaf."