What a man says in supplication while in the mosque

Sayyidah Fatimah, the daughter of the Messenger of Allah (peace and blessings be upon him) (may Allah be pleased with her), said: When the Messenger of Allah (peace and blessings be upon him) entered the mosque, he would supplicate thus: "I enter in the name of Allah and upon the way of the Messenger of Allah (peace and blessings be upon him). O Allah, forgive my sins and open for me the doors of Your mercy." And when he left, he would supplicate thus: "I leave in the name of Allah, and peace be upon the Messenger of Allah (peace and blessings be upon him). O Allah, forgive my sins and open for me the doors of Your bounty."

Al-Muttalib bin Abdullah bin Hantab said that when the Messenger of Allah (peace and blessings be upon him) entered the mosque, he would supplicate thus: "O Allah, open for me the doors of Your mercy and make easy for me the doors of Your provision."

Al-Nu'man bin Sa'd said that when Sayyiduna Ali (may Allah be pleased with him) entered the mosque, he would supplicate thus: "O Allah, forgive my sins and open for me the doors of Your mercy." And when he left the mosque, he would supplicate thus: "O Allah, forgive my sins and open for me the doors of Your bounty."

Sayyiduna Abu Hurayrah (may Allah be pleased with him) said: Sayyiduna Ka'b bin Ujrah (may Allah be pleased with him) said to me: "When you enter the Sacred Mosque, send greetings of peace upon the Prophet (peace and blessings be upon him) and recite this supplication: 'O Allah, open for me the doors of Your mercy.' And when you leave, send greetings of peace upon the Prophet (peace and blessings be upon him) and recite this supplication: 'O Allah, protect me from the accursed Satan.'"

Muhammad bin Abd al-Rahman said that when Sayyiduna Abdullah bin Salam (may Allah be pleased with him) entered the mosque, he would send greetings of peace upon the Prophet (peace and blessings be upon him) and recite this supplication: "O Allah, open for me the doors of Your mercy." And when he left the mosque, he would send greetings of peace upon the Prophet (peace and blessings be upon him) and seek refuge from Satan.

Sa'id bin Dhi Huddan said that when Alqamah entered the mosque, he would say: "O Prophet, peace be upon you, and may the mercy of Allah and His blessings descend. May Allah and His angels send blessings upon Muhammad (peace and blessings be upon him)."

Al-A'mash said that when Ibrahim entered the mosque, he would say: "I enter in the name of Allah, and peace be upon the Messenger of Allah (peace and blessings be upon him)."