Accountability and consequences of deeds

خَـٰلِدِينَ فِيهَا ۖ وَعْدَ ٱللَّهِ حَقًّا ۚ وَهُوَ ٱلْعَزِيزُ ٱلْحَكِيمُ

Wherein they abide eternally; [it is] the promise of Allāh [which is] truth. And He is the Exalted in Might, the Wise.