when Friday comes and our number may reach sixty or more. Are we obliged to establish the Jumuʿah (Friday congregational) prayer, or are we deemed travellers and therefore pray Ẓuhr (the noon prayer) instead? Should we perform qasr (shortening) and jamʿ (combining) even though praying on board does not require us to stand? We have set aside a place for worship, but at times it cannot hold everyone, so some pray in another adjoining area while following the same imām. Is this permissible, bearing in mind that they cannot see the imām yet can hear him? And what if this adjoining place is in front of the imām—would the prayer offered there be valid or not?
Answer: As for the Jumuʿah prayer, it is not valid in your situation, and what is required of you is to perform Ẓuhr, for Jumuʿah is only obligatory upon settled residents. A traveller—whether on a ship or otherwise—is not required to pray Jumuʿah, and if he does so it is invalid, unless he performs it behind the residents of a town; to establish it while still in a state of travel is not valid.
Regarding jamʿ, combining two prayers is only permitted when there is a need. If a genuine need arises such that you cannot offer each prayer in its appointed time, there is no objection to combining them.
Concerning the scenario where your designated space becomes too crowded and another adjacent area is used by worshippers following the same imām, this is acceptable provided they can hear the imām’s voice. However, they may not stand in front of him; rather, they must be to his right, to his left, or behind him. If they are positioned ahead of him, the prayer is invalid, because a follower’s proper position is behind the imām, or to his right or left when others are also standing on his right.
In short, one of the conditions for validly following the imām is that the follower must not be in front of him.