It was narrated that Abdul-Malik bin Saeed said: "I heard Abu Humaid and Abu Usaid say: The Messenger of Allah ﷺ said: "When any one of you enters the Masjid, let him say: Allahumma aftahli abwaba rahmatik (O Allah, open to me the gates of your mercy). And when he leaves let him say: Allahumma inni asaluka min fadlik (O Allah, I ask You of Your bounty)".