If you mean leaving a building, wait 'til the speaking and praying is over. Once other people start leaving, find your family members and friends, put your shoes back on as you leave, and go out the door. If you want to leave as in go become a different religion, there is no formality, just go.
To write an indefinite leave letter to an employer, write formally and explain why you are requesting the leave. Also, be sure to include any supporting documents.
MOSQUE
To write a letter for a vacation or leave, address the letter formally. You should also explain your reason for the leave, contact information for when you will be gone, and your expected return date.
Egypt is less formally known as The City of a 1000 minarats, so judging by the name, there must be loads of mosques in Egypt, no-one could give a crap about counting them all.
they were granted leave only if there was a very special reason but usually if they wanted to go home they would be formally discharged
There is no mosque in Dubai called the F Mosque.
grand mosque
There is no adjective to mosque. Mosque is the building where Muslims go for praying.
The lagest mosque in nigeria is kwara state mosque
The mosque near Regent's Park is called the London Central Mosque. It is also commonly known as the Regent's Park Mosque.
Al Badiyah Mosque
The fourth biggest mosque is Istiqlal Mosque in Jakarta, Indonesia