And We promised Musa (Moses) thirty nights and We made it good by adding to it (another) ten (nights). So the term (appointed) by his Lord was completed in forty nights. And Musa (Moses) said to his brother Harun (Aaron): ‘(In the meanwhile,) officiate at my seat among my people and continue to do (their) reformation, and follow not the way of those who create mischief (i.e. prevent them from treading this path).’