The ruling on making du'a' (supplication) by saying: "May Allah forgive you for what has come before of your sin and what has come after"

Question:
He says: Honorable Shaykh, may Allah grant you success, what is the ruling on my saying to a person, “May Allah forgive you” , whether as a supplication for him or as an expression of optimism?

Answer:
I do not know of anything that prevents this. Yes, if your intention is to inform, saying “May Allah forgive you” as a statement of fact is not permissible. But if your intention is supplication, it appears to me that there is no harm, if Allah wills. Yes, and Allah the Exalted knows best, and may Allah send prayers and peace upon our Prophet Muhammad and upon his family and his Companions.