﴿ رُّسُلًۭا مُّبَشِّرِينَ وَمُنذِرِينَ لِئَلَّا يَكُونَ لِلنَّاسِ عَلَى ٱللَّهِ حُجَّةٌۢ بَعْدَ ٱلرُّسُلِ ۚ وَكَانَ ٱللَّهُ عَزِيزًا حَكِيمًۭا ﴾

“[We sent all these] apostles as heralds of glad tidings and as warners, so that men might have no excuse before God after [the coming of] these apostles: and God is indeed al­mighty, wise.”

messengers rusulan substitutes for the previous rusulan ‘messengers’ bearing good tidings of reward for those that believe and warning of punishment for those that disbelieve; We sent them so that people might have no argument to make against God after the sending of the messengers to them and say Our Lord why did you not send a messenger to us so that we might follow Your signs and be among the believers Q. 2847; thus We sent them to pre-empt such excuses. God is ever Mighty in His kingdom Wise in His actions.