The ruling on one who leads the people in prayer and then remembers during the prayer that he is not in a state of ritual purity

Question:
One day I led the people in prayer, and during the prayer I remembered that I was not in a state of ritual purity. I did not know what to do, and I became flustered, so I completed the prayer with them. I have repeated the prayer for myself, but as for the followers, I did not tell them anything because I was shy. Please give us a ruling, may Allah reward you with good.

Answer:
Their prayer is valid because they did not know. If a person prays and then remembers that he is in a state of ritual impurity and completes the prayer, the prayer of the believers is valid. As for him, he must repeat it, and it is obligatory for him to fear Allah and to cut off the prayer; he should not complete it. If he becomes ritually impure or remembers that he is in a state of ritual impurity, he cuts off the prayer and appoints a substitute. That is, he says, "Step forward, so-and-so," and the one behind him moves back, and the one who stepped forward completes the prayer with them. This is what is called appointing a substitute. He says, "Step forward, so-and-so." If he does not appoint a substitute, one person steps forward and completes the prayer with them. Yes. Because when 'Umar was stabbed, he brought 'Abd al-Rahman forward and completed the prayer with the people. This is the best course of action. If he leaves them and they bring forward a person who prays with them, there is no harm. If they repeat it from the beginning, there is no harm. The matter is broad. Yes. May Allah reward you with good, and may Allah reward you.