The ruling on one who is asked about a matter and then realizes he gave the wrong answer

Question: If a person is asked about a matter and issues a ruling, and after some time it becomes clear to him that what he ruled was not correct, what must he do?

Answer: He must return to the truth and rule according to the right, saying, "I made a mistake," just as 'Umar said: "The truth is old." So he must return to the truth and rule according to the right, saying, "I made a mistake in the first matter; I ruled thus and thus, then it became clear to me that it was a mistake, and the correct ruling is thus and thus." There is no blame on him for that; rather, this is obligatory for him. The Prophet (peace and blessings be upon him), who is the head of those who issue rulings, when the people asked him about pollination, which is the pollination of date palms, said: Then they informed him that it harmed it, so he said: and ordered them to return to pollination.
Likewise, 'Umar (may Allah be pleased with him) ruled on excluding the brothers in the matter of the mixed inheritance, then ruled on sharing based on what appeared stronger to him in that.
So returning to what a scholar believes to be the truth and the right is a known matter, and it is the path of the people of knowledge and faith. There is no blame in that and no deficiency; rather, that indicates his excellence and the strength of his faith, where he returned to the truth and left the error.
If some people or some ignorant ones say: "This is a defect," then that is nothing. The truth is that it is an excellence and a virtue, not a deficiency.