الاعراف — Al-A'raf Ayat 142
۞ وَوٰعَدْنَا مُوْسٰى ثَلٰثِيْنَ لَيْلَةً وَّاَتْمَمْنٰهَا بِعَشْرٍ فَتَمَّ مِيْقَاتُ رَبِّهٖٓ اَرْبَعِيْنَ لَيْلَةً ۚوَقَالَ مُوْسٰى لِاَخِيْهِ هٰرُوْنَ اخْلُفْنِيْ فِيْ قَوْمِيْ وَاَصْلِحْ وَلَا تَتَّبِعْ سَبِيْلَ الْمُفْسِدِيْنَ
Wa wā‘adnā mūsā ṡalāṡīna lailataw wa atmamnāhā bi‘asyrin fa tamma mīqātu rabbihī arba‘īna lailah(tan), wa qāla mūsā li'akhīhi hārūnakhlufnī fī qaumī wa aṣliḥ wa lā tattabi‘ sabīlal-mufsidīn(a).
"And We made an appointment with Moses for thirty nights and perfected them by [the addition of] ten; so the term of his Lord was completed as forty nights. And Moses said to his brother Aaron, "Take my place among my people, do right [by them], and do not follow the way of the corrupters.""