Surah Al-Mu'minun, Verse 102

فَمَن ثَقُلَتۡ مَوَٰزِينُهُۥ فَأُوْلَٰٓئِكَ هُمُ ٱلۡمُفۡلِحُونَ١٠٢

faman thaqulat mawāzīnuhu fa-ulāika humu l-muf'liḥūna

And those whose scales are heavy [with good deeds] - it is they who are the successful.