The Imam Reading from a Book After the Prayer and the Ma'mum Reminding Him

Question:
Honorable Shaykh, may Allah grant you success. The imam of a mosque has a habit of reading from a book to the congregation immediately after finishing the 'Asr prayer. When he started reading, a ma'mum (one praying behind the imam) reminded him that he had missed something. Does their prayer become invalid and they must start over, or do they continue?

Answer:
This compensation that is not clear regarding the prayer; the compensation is outside the prayer. So, according to the rule, they continue, but, Allah knows best, they do not restart, because this is a minor interruption. My speech is also prescribed; it is not just ordinary talk, but it is prescribed from the hadiths of the Messenger of Allah (peace and blessings be upon him) or the recitation of a verse. This, if Allah wills, does not invalidate [the prayer]; he completes his prayer and continues the narration. However, if you talk to someone, asking about his condition, his children, or his tribes, then his prayer is not valid.