بُلُوغُ الْمَرَامِ
Bulugh al-Maram 701
Fasting
وَعَنْهَا قَالَتْ: { إِنْ كَانَ رَسُولُ اَللَّهِ - صلى الله عليه وسلم -لَيُدْخِلُ عَلَيَّ رَأْسَهُ -وَهُوَ فِي اَلْمَسْجِدِ- فَأُرَجِّلُهُ, وَكَانَ لَا يَدْخُلُ اَلْبَيْتَ إِلَّا لِحَاجَةٍ, إِذَا كَانَ مُعْتَكِفًا } مُتَّفَقٌ عَلَيْهِ, وَاللَّفْظُ لِلْبُخَارِيِّ [1] .
’A’isha (RAA) narrated, The Messenger of Allah (ﷺ) used to put his head into (the window of my house) while he was in the mosque (performing I'tikaf) and I would comb his hair. When he was in I'tikaf he would not enter the house except for some need.”Agreed upon and the wording is from Al-Bukhari.
Arabic/English book reference: Book 5, Hadith 721