۞ وَوٰعَدْنَا مُوْسٰى ثَلٰثِيْنَ لَيْلَةً وَّاَتْمَمْنٰهَا بِعَشْرٍ فَتَمَّ مِيْقَاتُ رَبِّهٖٓ اَرْبَعِيْنَ لَيْلَةً ۚوَقَالَ مُوْسٰى لِاَخِيْهِ هٰرُوْنَ اخْلُفْنِيْ فِيْ قَوْمِيْ وَاَصْلِحْ وَلَا تَتَّبِعْ سَبِيْلَ الْمُفْسِدِيْنَ ( الأعراف: ١٤٢ )
Wa waa'adnaa Moosaa salaaseena lailatanw wa at mamnaahaa bi'ashrim fatamma meeqaatu Rabbihee arba'eena lailah; wa qaala Moosaa liakheehi Haaroonakh lufnee fee qawmee wa aslih wa laa tattabi' sabeelal mufsideen (al-ʾAʿrāf 7:142)
Sahih International:
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." (Al-A'raf [7] : 142)
1 Mufti Taqi Usmani
And We made an appointment with Mūsā for thirty nights, then We supplemented them with another ten. So, the total period fixed by his Lord was forty nights. Mūsā said to his brother Hārūn, “Take my place among my people and keep things right, and do not follow the way of mischief makers.”