Musannaf Ibn Abi Shaybah 31753 — What a man says in supplication while

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.