The ruling on praying behind an innovator imam?

Question:
The questioner asks: What is the ruling on praying behind an imam who has memorized the Book of Allah the Exalted and teaches it to the students? He also relies on Ibn Kathir’s tafsir and reads it, and he says that Allah is in every place. He also says, from atop the minbar, that his shaykh, who recently passed away, fulfills people’s needs. He also said that the Messenger (peace and blessings be upon him) came and prayed over his shaykh. He advises this imam to read the books of al-Hallaj. What is the ruling on praying behind him? What is the ruling on the previous prayers? May Allah reward you with good.

Answer:
This man holds these false beliefs of hulul. He believes in hulul, that Allah has entered into every place. Glorified is Allah above that. He also believes that the dead benefit and harm.
He exaggerates in his shaykh and believes that the Messenger (peace and blessings be upon him) came and prayed over him. All of this is lies and fabrication. One does not pray behind such a person because his beliefs are false and take him out of the religion. They must repeat the prayers they prayed behind him because he is not a valid imam.
If they knew of these matters about him and prayed behind him, their prayer is invalid. But if they were ignorant and it did not become clear to them until later, the prayer they prayed while not knowing his condition is not repeated. However, the prayers they prayed after learning of his condition must be repeated. Yes.