Allah reminds the Children of Israel of the guidance that He sent to them by speaking directly to Musa and revealing the Tawrah to him. In it, was their law and the details of their legislation. Allah stated here that He appointed thirty nights for Musa. The scholars of Tafsir said that Musa fasted this period, and when they ended, Musa cleaned his teeth with a twig. Allah commanded him to complete the term adding ten more days, making the total forty. When the appointed term finished, Musa was about to return to Mount Tur, as Allah said,

﴿ظٹط¨ظژظ†ظگظ‰ ط¥ظگط³ظ’ط±ظژط،ظگظٹظ„ظژ ظ‚ظژط¯ظ’ ط£ظژظ†ط¬ظژظٹظ’ظ†ظژظ€ظƒظڈظ…ظ’ ظ…ظ‘ظگظ†ظ’ ط¹ظژط¯ظڈظˆظ‘ظگظƒظڈظ…ظ’ ظˆظژظˆظژط§ط¹ظژط¯ظ’ظ†ظژظ€ظƒظڈظ…ظ’ ط¬ظژط§ظ†ظگط¨ظژ ط§ظ„ط·ظ‘ظڈظˆط±ظگ ط§ظ„ط§ظ‘ظŒظٹظ’ظ…ظژظ†ظژ﴾

(O Children of Israel! We delivered you from your enemy, and We made a covenant with you on the right side of the Mount) ﴿20:80﴾. Musa left his brother Harun with the Children of Israel and commanded him to use wisdom and refrain from mischief. This was only a reminder, for Harun was an honorable and noble Prophet who had grace and exalted standard with Allah, may Allah's peace and blessings be upon him and the rest of the Prophets.

﴿ظˆظژظ„ظژظ…ظ‘ظژط§ ط¬ظژط¢ط،ظژ ظ…ظڈظˆط³ظژظ‰ ظ„ظگظ…ظگظٹظ‚ظژظ€طھظگظ†ظژط§ ظˆظژظƒظژظ„ظ‘ظژظ…ظژظ‡ظڈ ط±ظژط¨ظ‘ظڈظ‡ظڈ ظ‚ظژط§ظ„ظژ ط±ظژط¨ظ‘ظگ ط£ظژط±ظگظ†ظگظ‰ ط£ظژظ†ط¸ظڈط±ظ’ ط¥ظگظ„ظژظٹظ’ظƒظژ ظ‚ظژط§ظ„ظژ ظ„ظژظ† طھظژط±ظژط§ظ†ظگظ‰ ظˆظژظ„ظژظ€ظƒظگظ†ظگ ط§ظ†ظ’ط¸ظڈط±ظ’ ط¥ظگظ„ظژظ‰ ط§ظ„ظ’ط¬ظژط¨ظژظ„ظگ ظپظژط¥ظگظ†ظگ ط§ط³ظ’طھظژظ‚ظژط±ظ‘ظژ ظ…ظژظƒظژط§ظ†ظژظ‡ظڈ ظپظژط³ظژظˆظ’ظپظژ طھظژط±ظژط§ظ†ظگظ‰ ظپظژظ„ظژظ…ظ‘ظژط§ طھظژط¬ظژظ„ظ‘ظژظ‰ ط±ظژط¨ظ‘ظڈظ‡ظڈ ظ„ظگظ„ظ’ط¬ظژط¨ظژظ„ظگ ط¬ظژط¹ظژظ„ظژظ‡ظڈ ط¯ظژظƒظ‘ظ‹ط§ ظˆظژط®ظژط±ظ‘ظژ ظ…ظˆط³ظژظ‰ طµظژط¹ظگظ‚ظ‹ط§ ظپظژظ„ظژظ…ظ‘ظژط¢ ط£ظژظپظژط§ظ‚ظژ ظ‚ظژط§ظ„ظژ ط³ظڈط¨ظ’ط­ظژظ€ظ†ظژظƒظژ طھظڈط¨ظ’طھظڈ ط¥ظگظ„ظژظٹظ’ظƒظژ ظˆظژط£ظژظ†ظژط§ظ’ ط£ظژظˆظ‘ظژظ„ظڈ ط§ظ„ظ’ظ…ظڈط¤ظ’ظ…ظگظ†ظگظٹظ†ظژ ﴾

(143. And when Musa came at the time and place appointed by Us, and his Lord (Allah) spoke to him; he said: "O my Lord! Show me (Yourself), that I may look upon You.'' Allah said: "You cannot see Me, but look upon the mountain; if it stands still in its place then you shall see Me.'' So when his Lord appeared to the mountain, He made it collapse to dust, and Musa fell down unconscious. Then when he recovered his senses he said: "Glory be to You, I turn to You in repentance and I am the first of the believers.'')