83. They recognise
the Grace of Allâh, yet they deny it (by worshipping others
besides Allâh) and most of them are disbelievers (deny the
Prophethood of Muhammad SAW).
84. And (remember)
the Day when We shall raise up from each nation a witness (their
Messenger), then, those who have disbelieved will not be given
leave (to put forward excuses), nor will they be allowed (to return
to the world) to repent and ask for Allâh's Forgiveness
(of their sins, etc.).