Surah Al-A'raf, ayah 8

وَٱلۡوَزۡنُ يَوۡمَئِذٍ ٱلۡحَقُّۚ فَمَن ثَقُلَتۡ مَوَٰزِينُهُۥ فَأُوْلَٰٓئِكَ هُمُ ٱلۡمُفۡلِحُونَ ٨

Wal-waznu yawma'idhinil-haqqu faman thaqulat mawāzīnuhū fa ulā'ika humul-muflihūn

And the weighing [of deeds] that Day will be the truth. So those whose scales are heavy - it is they who will be the successful.