They only are true believers who believe in God and His Messenger, and who, whenever they are with him upon a matter requiring collective action, do not depart unless they have obtained his leave. Those who ask leave of you are indeed the ones who believe in God and His Messenger. Hence, when they ask your leave to attend to some business of theirs, grant you this leave to whomever of them you choose, and pray to God to forgive them. God is indeed much-forgiving, ever-merciful.