The Kneeling
فَأَمَّا ٱلَّذِينَ ءَامَنُوا۟ وَعَمِلُوا۟ ٱلصَّـٰلِحَـٰتِ فَيُدْخِلُهُمْ رَبُّهُمْ فِى رَحْمَتِهِۦ ۚ ذَٰلِكَ هُوَ ٱلْفَوْزُ ٱلْمُبِينُ
So as for those who believed and did righteous deeds, their Lord will admit them into His mercy. That is what is the clear attainment.
Nearby ayahs help place verse 45:30 in sequence and meaning.
وَتَرَىٰ كُلَّ أُمَّةٍ جَاثِيَةً ۚ كُلُّ أُمَّةٍ تُدْعَىٰٓ إِلَىٰ كِتَـٰبِهَا ٱلْيَوْمَ تُجْزَوْنَ مَا كُنتُمْ تَعْمَلُونَ
And you will see every nation kneeling [from fear]. Every nation will be called to its record [and told], "Today you will be recompensed for what you used to do.
هَـٰذَا كِتَـٰبُنَا يَنطِقُ عَلَيْكُم بِٱلْحَقِّ ۚ إِنَّا كُنَّا نَسْتَنسِخُ مَا كُنتُمْ تَعْمَلُونَ
This, Our record, speaks about you in truth. Indeed, We were having transcribed whatever you used to do."
وَأَمَّا ٱلَّذِينَ كَفَرُوٓا۟ أَفَلَمْ تَكُنْ ءَايَـٰتِى تُتْلَىٰ عَلَيْكُمْ فَٱسْتَكْبَرْتُمْ وَكُنتُمْ قَوْمًا مُّجْرِمِينَ
But as for those who disbelieved, [it will be said], "Were not Our verses recited to you, but you were arrogant and became a people of criminals?
وَإِذَا قِيلَ إِنَّ وَعْدَ ٱللَّهِ حَقٌّ وَٱلسَّاعَةُ لَا رَيْبَ فِيهَا قُلْتُم مَّا نَدْرِى مَا ٱلسَّاعَةُ إِن نَّظُنُّ إِلَّا ظَنًّا وَمَا نَحْنُ بِمُسْتَيْقِنِينَ
And when it was said, 'Indeed, the promise of Allah is truth and the Hour [is coming] - no doubt about it,' you said, 'We know not what is the Hour. We assume only assumption, and we are not convinced.' "