If the imam of the congregational prayers knows the correct recitation but he made a mistake out of negligence in a prayer, the person following him in the prayer, who knows the correct way, should recite the mistaken part himself. He can continue to pray behind such an imam.If the imam made the mistake in the recitation because he does not know the correct recitation, the person following him should recite the mistaken part properly and should not pray behind this person again based on compulsory precaution.