Prayer Without Ablution

Question
A mosque imam prayed with a large number of worshippers, and at the end of the prayer, he remembered that he was not in a state of ablution and repeated the prayer. Should he inform the worshippers that he is not in a state of ablution, or is the prayer of the followers valid?
Answer
I say, and with God's help: The prayer of those who follow is invalid, and it is necessary to inform them if that is possible and does not cause strife among them. And God knows best.
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