Quran 7, Al-A'raf (The Heights) ⓘ

7:8The weighing on that day is the true (weighing). As for those whose scale is heavy, they are the successful.

وَالْوَزْنُ يَوْمَئِذٍ الْحَقُّ فَمَنْ ثَقُلَتْ مَوَازِينُهُ فَأُولَئِكَ هُمُ الْمُفْلِحُونَ

7:9And as for those whose scale is light: those are they who lose their souls because they used to wrong Our revelations.

وَمَنْ خَفَّتْ مَوَازِينُهُ فَأُولَئِكَ الَّذِينَ خَسِرُوا أَنْفُسَهُمْ بِمَا كَانُوا بِآيَاتِنَا يَظْلِمُونَ