The Hour will come so that each Person will be rewarded or punished in accordance with His Deeds

This is one of three Ayat -- there is no fourth -- where Allah commands His Messenger to swear by His Almighty Lord that the resurrection will surely come, because the stubborn followers of disbelief denied that it would happen. One of these Ayat is in Surah Yunus, where Allah says:

وَيَسْتَنْبِئُونَكَ أَحَقٌّ هُوَ قُلْ إِى وَرَبِّى إِنَّهُ لَحَقٌّ وَمَآ أَنتُمْ بِمُعْجِزِينَ

And in contrast to them stand: الَّذِينَ سَعَوْا فِي آيَاتِنَا (5) i.e. those who made efforts to find faults with Our verses and tried to stop people from believing in them.

The word: مُعَاجِزِينَ which appears immediately after the verse cited above means that this effort by them was as if they would render Us helpless in seizing them and would thus go scot-free from having to be present on the last day of Qiyamah.