Sunan Abu Dawud
2467
Sahih+1

Aishah said: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)

SahihAl-Albani
Sahih Muslim (297)Zubair Ali Zai