If a person touches an object and does not know that it is Najis, and later finds out that it was Najis at the time of touching, what is the ruling on their hand and on the other things they touched before they gained this knowledge?
If he is sure that he touched the item which was in fact Najis, with a wet hand or the item was wet, then his hand became Najis even if he was unaware that it was Najis when he touched it. If he is not sure that his hand was wet or the item was wet when was touched by him, then his hand is Najis. Same also is the rule for other items touched by him later on whether he was sure that his hand was wet or the item itself was wet when it was touched by his Najis hand.
Wassalam.