Surat Al-'A`rāf - سورة الأعراف

وَالْوَزْنُ يَوْمَئِذٍ الْحَقُّ ۚ فَمَن ثَقُلَتْ مَوَازِينُهُ فَأُولَٰئِكَ هُمُ الْمُفْلِحُونَ

: And the weighing on that day (Day of Resurrection) will be the true (weighing). So as for those whose scale (of good deeds) will be heavy, they will be the successful (by entering Paradise).