A man wiped over his leather socks for two full days while he was a resident, out of ignorance. What is the ruling on his prayers?

Question:
Honorable Shaykh, may Allah grant you success. He says: A man did not know the ruling on wiping over leather socks, so he was wiping over his socks for two full days while he was a resident for about a month. What is the ruling on his past prayers?

Answer:
They are not valid, because wudu' is not excused by forgetfulness. What is obligatory is not excused by forgetfulness; it is required to perform it. Wudu' is a condition for the validity of the prayer, so it is not excused by forgetfulness or ignorance. Therefore, the prayer must be repeated. Yes.