Prayer: Rows Extending to the Mosque's Door
Practical Laws of Islam as per the teachings of Ayatullah Sistani
Ruling 1393
If the rows of a congregation extend to the mosque's door, the prayer of someone standing in front of the door behind the row is valid. Also, the prayer of those who follow behind him is valid. In fact, the prayer of those standing on either side and are linked to the congregation by means of another follower is also valid.