ذِكْرُ السَّبَبِ الَّذِي مِنْ أَجْلِهِ يَدْخُلُ الْمُعْتَكِفُ بَيْتَهُ فِي اعْتِكَافِهِ
When the Messenger of Allah ﷺ observed I'tikaf, he would put his head near me, and I would comb it. and he entered the house only to fulfill human needs (i.e. to urinate or to relieve himself). (Using translation from Abū Dāʾūd 2467)
أَنَّهَا قَالَتْ «كَانَ رَسُولُ اللَّهِ ﷺ إِذَا اعْتَكَفَ أَدْنَى إِلَيَّ رَأْسَهُ فَأُرَجِّلُهُ فَكَانَ لَا يَدْخُلُ الْبَيْتَ إِلَّا لِحَاجَةِ الْإِنْسَانِ»