ANSWER:

This is the sunnah.

The authentic duaa is to say: bismillah, Allahumma salli Ala Mohammed, allahumma iftahli Abwab rahmatic when entering and something similar to that when exiting.

Sheikh, is it Mandatory to enter the Masjid with right foot first and then the left foot next? And leaving with the left foot first and then the right foot next? And also what is the Du’a to be said when entering the Masjid and when leaving the Masjid?

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