Word by Word Analysis

وَٱلَّذِينَ ءَامَنُوا۟ وَٱتَّبَعَتْهُمْ ذُرِّيَّتُهُم بِإِيمَـٰنٍ أَلْحَقْنَا بِهِمْ ذُرِّيَّتَهُمْ وَمَآ أَلَتْنَـٰهُم مِّنْ عَمَلِهِم مِّن شَىْءٍ ۚ كُلُّ ٱمْرِئٍۭ بِمَا كَسَبَ رَهِينٌ 21

And those who believed and whose descendants followed them in faith - We will join with them their descendants, and We will not deprive them of anything of their deeds. Every person, for what he earned, is retained.