Musannaf Ibn Abi Shaybah 3451 — What a man says on entering the mosque

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