The congregation’s doubt about missing a prostration after the completion of the Friday prayer

Question:
A group of people prayed the Friday prayer, and when they finished, most of the worshippers doubted that they had not performed the second prostration. What should they do? Or, a group of people prayed the Friday prayer, and when they finished, one of the worshippers doubted that he had not performed the seventh prostration. What should they do? And is the doubt of one of the worshippers considered in the face of certainty? If the ruling is to repeat the prayer, does the imam have to inform all the worshippers? And how does he inform them?

Answer:
If the doubt occurred during the prayer, they are required to repeat the prayer as the midday prayer. However, if the doubt occurred only after the prayer, they owe nothing, because doubt after the act of worship does not affect it. Only doubt that occurs within the act of worship itself is significant. So, if the doubt occurred while they were praying, they must repeat the prayer, because the default is that the prostration was not performed, and the conscience is not cleared except by certainty. But if they did not have any doubt when they said the closing salam, and the doubt only arose afterwards, then it has no effect, and their prayer is valid, and praise be to Allah. And Allah knows best. May Allah send prayers and blessings upon our Prophet Muhammad and upon his family and his Companions.