The ruling on one who finds moisture on his clothes after prayer and does not know if it is impure or not-Ibn

Question : The questioner asks: What is the ruling on one who performs wudu after a state of ritual impurity, then goes and prays, and after the prayer finds a trace that he does not know if it is impurity or something else? Does he have to repeat the prayer, knowing that this has happened many times?

Answer : If a person performs wudu and prays, then finds a trace on his garment after his prayer, and he does not know if it is impurity or not, then his prayer is valid and it is not obligatory for him to wash it, because the default is purity, so it is not obligatory for him to wash it. However, if he becomes certain after praying that what is on his garment is impurity, and he is certain that it is impurity, then it is not obligatory for him to repeat the prayer. This is because if a person prays in a garment that is impure while ignorant, or prays in a garment that is impure while forgetting, he does not have to repeat the prayer. For example, suppose urine got on your garment and you forgot to wash it and you prayed, then your prayer is valid. Or if impurity from blood or something else got on it, and you did not know about it until after you prayed, then your prayer is valid. Evidence for this is the generality of the statement of Allah the Exalted: Also, the action of the Messenger (peace and blessings be upon him) is evidence for this, where he once prayed wearing his leather socks, and Jibril informed him that there was harm in them, so the Messenger (peace and blessings be upon him) took them off while he was in prayer and did not restart the prayer. If the prayer were invalidated by ignorance, the Messenger (peace and blessings be upon him) would have restarted his prayer.