The mosque is the place of worship, the house of Allah. Due to the significance of this Holy house, when a Muslim is entering the Mosque, he has to follow the instructions laid down by the Messenger of Allah.
Some of these laid down procedures include the Dua for entering and Leaving the Mosque according to our Beloved Prophet (ﷺ).
First of all, while entering the Mosque, you should enter with his right leg first saying the following Du’a.
Dua before entering the Mosque
Fatima, daughter of the Prophet (ﷺ) said, “Whenever Allah’s Messenger entered the mosque, he would utter:
“BISMILLAAHI WAS-SALAAMU ‘ALAA RASOOLILLAAHI. ALLAAHUMMAGH FIRLEE ZUNOOBEE, WAFTAH-LEE ABWAABA RAHMATIKA.”
“In the name of Allah, Peace be upon Allah’s Messenger. Oh Allah! Forgive me my sins and open for me the doors of your Mercy.”
Dua before Leaving the Mosque
And when he comes out of the Mosque he would pray:
“BISMILLAAHI WAS-SALAAMU ‘ALAA RASOOLIL LAAHI. ALLAAHUMAGH FIRLEE ZUNOOBEE, WAFTAH-LEE ABWAABA FADLIK.”
‘In the name of Allah, peace be upon Allah’s Messenger. Oh Allah! Forgive me my sins and open for me the doors of your bounty.’”
May Allah increase us in knowledge!