7:9
وَمَنْ خَفَّتْ مَوَٰزِينُهُۥ فَأُو۟لَـٰٓئِكَ ٱلَّذِينَ خَسِرُوٓا۟ أَنفُسَهُم بِمَا كَانُوا۟ بِـَٔايَـٰتِنَا يَظْلِمُونَ
waman khaffat mawāzīnuhu fa-ulāika alladhīna khasirū anfusahum bimā kānū biāyātinā yaẓlimūna
and those whose good deeds are light will be the ones who have lost their souls through their wrongful rejection of Our messages.
And as for those whose scale will be light, they are those who will lose their ownselves (by entering Hell) because they denied and rejected Our Ayât (proofs, evidence, verses, lessons, signs, revelations, etc.).