Quran 52:21

وَٱلَّذِينَ ءَامَنُواْ وَٱتَّبَعَتۡہُمۡ ذُرِّيَّتُہُم بِإِيمَـٰنٍ أَلۡحَقۡنَا بِہِمۡ ذُرِّيَّتَہُمۡ وَمَآ أَلَتۡنَـٰهُم مِّنۡ عَمَلِهِم مِّن شَىۡءٍ۬‌ۚ كُلُّ ٱمۡرِىِٕۭ بِمَا كَسَبَ رَهِينٌ۬ ٢١

For those who believed, and their children also followed them in belief, we will have their children join them. We never fail to reward them for any work. Every person is paid for what he did.