Imam Sadiq (a.s) quoted on the authority of God's Prophet (a.s)
“Staying in the mosque is the Arab form of monasticism. The mosque is a believer's social gathering place, but his monastery is his house.”
عنه (عليه السلام) قال
قال رسول الله (صلى الله عليه وآله): الاتكاء في المسجد رهبانية العرب، إن المؤمن مجلسه مسجده، وصومعته بيته.
Similar narrations
Al-Kāfi #2273“The Messenger of Allah has said, ‘Sitting in the Mosque in a leaning posture is the monkish practice of the Arabs. The gathering place of...