Chapter
Retiring to a Mosque for Remembrance of Allah (I'tikaf) - Sunnah.com - Sayings and Teachings of Prophet Muhammad (صلى الله عليه و سلم)
From Sahih al-Bukhari - Sunnah.com - Sayings and Teachings of Prophet Muhammad (صلى الله عليه و سلم) by Sahih El Boukhari