Overall meaning : Almighty Allah says: mention to the people, O Muhammad, the day when We will gather out of every nation a large group of those who disbelieve the verses and clear proofs of the Qur’an, and they will be marshalled so that the former groups will be held back for the latter to join them before they will be driven to the place of reckoning.
When they finally come before their Lord, He will reproachfully say to them, ‘Did you deny My Book’s verses and proofs when you were totally ignorant of them and did not comprehend them, or what is it that you were doing?!’
Allah’s punishment and wrath on that day will descend upon these unbelievers for having wronged themselves due to their unbelief, and they will not be able to utter a single word of excuse!