If one backbites his Muslim brother, is it sufficient to seek forgiveness for him and make du'a for him?

Question:
May Allah keep you safe, but I did not backbite you. Is it sufficient for the brother who backbited you to seek forgiveness?

Answer:
It is not sufficient; he must seek his forgiveness, unless that is not possible. If it is not possible, he should seek forgiveness from Allah and mention him with the good he knows of him. This is because the Messenger (peace and blessings be upon him) said: "Whoever has at his disposal a wrong against his brother, whether in his honor or otherwise, let him seek his forgiveness today before there is no dinar or dirham [left]." But if seeking his forgiveness is not possible, or if he fears that seeking it will lead to evil, he should make du'a for him, seek forgiveness for him, and mention him with the good he knows of him. He should mention him with the good qualities he knows of him in the places where he criticized him and faulted him, so that this [will suffice]. Yes. May Allah reward you.