The Holy Quran 7:142 — Surah Al-A'raf
Arabic text
۞ وَوَٰعَدْنَا مُوسَىٰ ثَلَـٰثِينَ لَيْلَةً وَأَتْمَمْنَـٰهَا بِعَشْرٍ فَتَمَّ مِيقَـٰتُ رَبِّهِۦٓ أَرْبَعِينَ لَيْلَةً ۚ وَقَالَ مُوسَىٰ لِأَخِيهِ هَـٰرُونَ ٱخْلُفْنِى فِى قَوْمِى وَأَصْلِحْ وَلَا تَتَّبِعْ سَبِيلَ ٱلْمُفْسِدِينَ
Translation
We made an appointment with Moosa عليه الصلاة والسلام for thirty nights (at Mount Toor), then ended it with (another) ten (nights) to complete (totally) his Rabb's term of forty nights (during which time Allaah spoke to Moosa عليه الصلاة والسلام and gave him the Torah). Moosa عليه الصلاة والسلام said to his brother Haroon عليه الصلاة والسلام (as he left for Mount Toor), "Take my place as leader of my people. Keep the (affairs of the people in) order and do not (ever) follow the path of those who cause corruption."
Tafsir (excerpt) — Tafsir Usmani
The promise of forty nights on Mount Tur: when the Children of Israel had found relief from troubles of every kind, they asked Musa ﵇: “Now bring us a heavenly shariah which we will follow wholeheartedly and so show [our devotion].” Musa ﵇ presented their request before the Divine court.
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