And We appointed with Musa a time of thirty nights and completed them with ten (more), so the appointed time of his Lord was complete forty nights, and Musa said to his brother Haroun: Take my place among my people, and act well and do not follow the way of the mischief-makers.

And when Musa returned to his people, wrathful (and) in violent grief, he said: Evil is it that you have done after me; did you turn away from the bidding of your Lord? And he threw down the tablets and seized his brother by the head, dragging him towards him. He said: Son of my mother! surely the people reckoned me weak and had well-nigh slain me, therefore make not the enemies to rejoice over me and count me not among the unjust people.

He said: O my people! have you considered if I have a clear proof from my Lord and He has given me a goodly sustenance from Himself, and I do not desire that in opposition to you I should betake myself to that which I forbid you: I desire nothing but reform so far as I am able, and with none but Allah is the direction of my affair to a right issue; on Him do I rely and to Him do I turn:

So Musa returned to his people wrathful, sorrowing. Said he: O my people! did not your Lord promise you a goodly promise: did then the time seem long to you, or did you wish that displeasure from your Lord should be due to you, so that you broke (your) promise to me?