An Imam (the one who leads congregational Prayer) made a mistake when he forgot to recite an Ayah (Qur'anic verse). Only four hours later, one of those who were offering Salah behind the Imam told him about his mistake. Should he repeat the Salah?
It is permissible for a person led by an Imam to correct his Imam, if the Imam makes a mistake while reciting the Qur'an. However, if the Imam is not corrected by anybody, his Salah is still valid and may not be repeated unless the Ayahs missed are from Surah Al-Fatihah. (Part No. 6; Page No. 400) May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.