they only are true believers who believe in god and his messenger. when they are with him on some matter of common concern they should not depart until they have asked him for permission to do so. those who ask you for such permission are the ones who truly believe in god and his messenger. when they ask you for permission to attend to some affair of their own then grant it to whoever you please and seek forgiveness from god for them. god is forgiving and merciful.
إنما المؤمنون الذين آمنوا بالله ورسوله وإذا كانوا معه على أمر جامع لم يذهبوا حتى يستأذنوه إن الذين يستأذنونك أولئك الذين يؤمنون بالله ورسوله فإذا استأذنوك لبعض شأنهم فأذن لمن شئت منهم واستغفر لهم الله إن الله غفور رحيم