Only those are believers who believe in Allah and His Messenger, and when they are with him (the Messenger) upon some common business, go not away until they have asked leave of him. Verily, those who ask your leave they it is who believe in Allah and His Messenger. So, if they ask your leave for any of their own concerns, then give leave to whomever you will of them, and ask for them forgiveness of Allah; verily, Allah is Forgiving and Merciful.