Is it permissible to combine the 'Isha' prayer with a group who combined it due to heavy rain, if the rain stopped at the time of the Maghrib prayer and then resumed after the combination?

Question:
He says: Honorable Shaykh, may Allah grant you success. If heavy rain falls and stops at the time of the Maghrib prayer, allowing the people to pray and combine the 'Isha' prayer with it, and then the rain resumes about ten minutes after their prayer, what is the best course of action for me? Should I combine with them, and would I be sinful if I did?

Answer:
Combine with the Muslims as long as they have combined; combine with them. Heavy rain is not light drizzle or a heavy shower that merely wets the clothes. So if they combine, combine with them. Yes.