Exodus 34:28

Then Moses entered the midst of the cloud as he went up to the mountain; and Moses was on the mountain forty days and forty nights.

When He had finished speaking with him upon Mount Sinai, He gave Moses the two tablets of the testimony, tablets of stone, written by the finger of God.

Then God said, “Behold, I am going to cut a covenant. Before all your people I will do wondrous deeds which have not been created in all the earth nor among any of the nations; and all the people among whom you live will see the working of Yahweh, for it is a fearful thing that I am going to do with you.

“So He declared to you His covenant which He commanded you to do, that is, the Ten Commandments; and He wrote them on two tablets of stone.

“When I went up to the mountain to receive the tablets of stone, the tablets of the covenant which Yahweh had cut with you, then I remained on the mountain forty days and nights; I neither ate bread nor drank water.

“And I fell down before Yahweh, as at the first, forty days and nights; I neither ate bread nor drank water because of all your sin which you had committed in doing what was evil in the sight of Yahweh to provoke Him to anger.

“And He wrote on the tablets, like the former writing, the Ten Commandments which Yahweh had spoken to you on the mountain from the midst of the fire on the day of the assembly; and Yahweh gave them to me.

“I, moreover, stayed on the mountain forty days and forty nights like the first time, and Yahweh listened to me that time also; Yahweh was not willing to destroy you.

So he arose and ate and drank, and went in the strength of that food forty days and forty nights to Horeb, the mountain of God.

And after He had fasted forty days and forty nights, He then became hungry.

for forty days, being tempted by the devil. And He ate nothing during those days, and when they had finished, He was hungry.