The Ten Commandments

We appointed forty nights for Moses, but in his absence, you took the calf for worship, acting unjustly.

2:51And when We did appoint for Moses forty nights (of solitude), and then ye chose the calf, when he had gone from you, and were wrong-doers.

7:142And when We did appoint for Moses thirty nights (of solitude), and added to them ten, and he completed the whole time appointed by his Lord of forty nights; and Moses said unto his brother, Aaron: Take my place among the people. Do right, and follow not the way of mischief-makers.