What is the ruling on some people saying "if Allah wills" at the end of their supplication?

Question : May Allah reward you with good. The phrase "if Allah wills" has become common in the speech of many people nowadays when they say, for example, "May Allah grant us and you success, if Allah wills," as a kind of generosity.

Answer : It is better not to say it. However, if one says "if You will," that is forbidden (haram). The Messenger (peace and blessings be upon him) prohibited it. If one says, "O Allah, forgive me if You will," or "O Allah, have mercy on me if You will," that is forbidden. But if one says "if Allah wills," since it relies on seeking blessing (tabarruk) and on making the request conditional, we say it is preferable to leave it out, because it relies on seeking blessing and on making the request conditional. A person in supplication should not make his request conditional, but should be resolute in asking and expect the response.