The ruling on one who swears an oath regarding something, then it becomes clear to him that it is contrary to his assumption

Question:
May Allah reward you with good, and may He do you well. A listener sent a message containing a question. He says: I swore an oath because of a dispute that occurred between me and some people, and I believed it to be true, but it turned out otherwise, and it became clear that the truth was with them and that I had sworn in error. What is the ruling on this oath, and what is the expiation? May Allah reward you with good. The sender of this message is the listener Abdullah ibn Muhammad al-Ra'is from Riyadh.

Answer:
As long as you did not intend the error, this is from the slip of the tongue in oaths, in which there is no sin. Allah the Exalted said: So if you swear to something believing in its truth, and it is most likely in your mind that you are truthful, but it later turns out that you were mistaken, there is no blame on you. This is from the slip of the tongue in oaths.