It is narrated from Sayyiduna Abu Hurairah, may Allah be pleased with him, that the Messenger of Allah, peace and blessings be upon him, said: Some people sit in the mosques like pegs; the angels are their companions. If they are absent, the angels search for them; if they are ill, the angels visit them; if they are occupied with some work, the angels assist them. And the Prophet, peace and blessings be upon him, said: The one who sits in the mosque is upon three qualities: a brother from whom benefit is gained, or a firm word, or such a mercy that is awaited.

It is narrated from Sayyiduna Abu Hurairah, may Allah be pleased with him, that the Noble Prophet, peace and blessings be upon him, said: No Muslim makes the mosques his abode for prayer and remembrance except that when he leaves his house, Allah Almighty becomes as pleased with him as the family of a person who was absent becomes pleased upon his arrival.

Sayyiduna Abu Hurairah (may Allah be pleased with him) narrates that the Noble Prophet (peace and blessings be upon him) said: Whoever goes to and from the mosque, Allah Almighty prepares hospitality (provisions) for him every time he goes to and from.

Sayyiduna Abu Sa'id Khudri (may Allah be pleased with him) narrates that the Messenger of Allah (peace and blessings be upon him) said: When you see a man who is accustomed to coming and going to the mosque, then bear witness to his faith, because Allah Almighty says: Only those maintain the mosques of Allah who believe in Allah and the Last Day.

Abdullah bin Amir Al-Hani narrates: Sayyiduna Habas bin Saeed Tai (may Allah be pleased with him), who had seen the Noble Prophet (peace and blessings be upon him), entered the mosque at the time of suhoor and saw that people were praying in the front part of the mosque. Upon seeing this, he said: By the Lord of the Ka'bah! These people are showing off; warn them. Whoever warned them has obeyed Allah and His Messenger (peace and blessings be upon him). Hearing this, the people went to him and took him outside. Then Sayyiduna Habas (may Allah be pleased with him) said: At the time of suhoor, the angels pray in the front part of the mosque.

Abdul Malik bin Saeed bin Suwaid Ansari says that I heard from Sayyiduna Abu Humaid and Sayyiduna Abu Usaid (may Allah be pleased with them both), they were stating that the Messenger of Allah (peace and blessings be upon him) said: When any one of you enters the mosque, he should recite this supplication: "Allahumma iftah lana abwaba rahmatik" (O Allah! Open for us the doors of Your mercy), and when he leaves the mosque, he should recite: "Allahumma inni as'aluka min fadlik" (O Allah! I ask You for Your bounty).

It is narrated from Sayyidah Fatimah, the daughter of the Messenger of Allah, may Allah be pleased with her and grant her satisfaction, that when the Messenger of Allah, peace and blessings be upon him, would enter the mosque, he would send blessings and peace upon Muhammad, peace and blessings be upon him, and in one narration, he would recite this supplication: "Bismillah, was-salamu ‘ala Rasulillah" (In the name of Allah, and peace be upon the Messenger of Allah), and then he would recite: "Allahumma ighfir li dhunubi waftah li abwaba rahmatik." (O Allah! Forgive my sins and open for me the doors of Your mercy.) And when he, peace and blessings be upon him, would leave, he would send blessings and peace upon Muhammad, peace and blessings be upon him, and in one narration, he would say: "Bismillah, was-salamu ‘ala Rasulillah," and then recite this supplication: "Allahumma ighfir li dhunubi waftah li abwaba fadlik." (O Allah! Forgive my sins and open for me the doors of Your bounty.)

Ubaidullah bin Abdur Rahman bin Muhib narrates from a servant of Sayyiduna Abu Sa'id Khudri (may Allah be pleased with him), who says: I was in the company of Sayyiduna Abu Sa'id (may Allah be pleased with him) with the Messenger of Allah (peace and blessings be upon him), we entered the mosque and saw that a man was sitting cross-legged in the middle of the mosque, intertwining the fingers of his hands. The Messenger of Allah (peace and blessings be upon him) gestured to him, but the man did not understand. Then the Prophet (peace and blessings be upon him) turned to Sayyiduna Abu Sa'id Khudri (may Allah be pleased with him) and said: When any of you is in the mosque, he should not intertwine his fingers, because intertwining is from Satan, and indeed as long as a person remains in the mosque, he is considered to be in prayer until he leaves the mosque.

Sayyiduna Ka’b bin ‘Ujrah (may Allah be pleased with him) narrates that the Messenger of Allah (peace and blessings be upon him) came to me in the mosque while I had interlaced my fingers. He (peace and blessings be upon him) said to me: O Ka’b! When you are in the mosque, do not interlace your fingers, because as long as you are waiting for the prayer, you are considered to be in prayer.

It is narrated from Sayyiduna Abu Musa Ash'ari, may Allah be pleased with him, that the Noble Prophet, peace and blessings be upon him, said: When you pass through the markets of the Muslims or their mosques with arrows, hold them by their tips (the sharp ends), lest you injure someone with them.