Quran 7:141 — The Purgatory (Al-A'araf)

Recall that we delivered you from Pharaoh's people, who inflicted the worst persecution upon you, killing your sons and sparing your daughters. That was an exacting trial for you from your Lord.

[7:140] "Shall I seek for you other than GOD to be your god, when He has blessed you more than anyone else in the world?"

[7:142] We summoned Moses for thirty* nights, and completed them by adding ten.* Thus, the audience with his Lord lasted forty* nights. Moses said to his brother Aaron, "Stay here with my people, maintain righteousness, and do not follow the ways of the corruptors."