The ruling on completing the prayer with the congregation upon remembering a state of ritual impurity

Question:
He says: Honorable Shaykh, may Allah grant you success. The questioner says: I entered the prayer and then remembered that I was in a state of ritual impurity, and there were rows of people behind me. He says: I entered the prayer with the imam and then remembered that I was in a state of ritual impurity, and there were rows behind me. It was difficult for me to break the prayer, so I completed it with them until the prayer ended. Then I repeated it after performing the ablution. Is there anything required of me for this action?

Answer:
Yes. It is not permissible for you to pray while you are not in a state of ritual purity. Sit down, at least sit down. Do not pray with them and do not follow them. Sit down, and that will be an excuse for you. If what happened to you occurs, you may leave. But that you pray is not permissible.