Read and reflect on verse 1096 from Surah Al-A'raaf: AND [then] We appointed for Moses thirty nights [on Mount Sinai]; and We added to them ten, whereby the term of forty nights set bye, his Sustainer wa...
۞ وَوَاعَدْنَا مُوسَىٰ ثَلَاثِينَ لَيْلَةً وَأَتْمَمْنَاهَا بِعَشْرٍ فَتَمَّ مِيقَاتُ رَبِّهِ أَرْبَعِينَ لَيْلَةً ۚ وَقَالَ مُوسَىٰ لِأَخِيهِ هَارُونَ اخْلُفْنِي فِي قَوْمِي وَأَصْلِحْ وَلَا تَتَّبِعْ سَبِيلَ الْمُفْسِدِينَ
AND [then] We appointed for Moses thirty nights [on Mount Sinai]; and We added to them ten, whereby the term of forty nights set bye, his Sustainer was fulfilled. And Moses said unto his brother Aaron: "Take thou my place among my people; and act righteously, and follow not the path of the spreaders of corruption."