Exodus 24:12-18 - Forty Days And Nights On Mount Sinai
12 And Jehovah will say to Moses, Come up to me to the mountain, and be there: and I will give to thee tablets of stone, and the law and the commands which I wrote, to teach them.
13 And Moses will rise up, and Joshua, his minister; and Moses will go up to the mountain of God. 14 And he said to the old men, Abide for us here, till when we shall turn back to you: and behold, Aaron and Hur with you; whoever having words shall draw near to them. 15 And Moses will go up to the mountain and the cloud will cover the mount 16 And the glory of Jehovah will settle down upon mount Sinai, and the cloud will cover it six days: and he will call to Moses in the seventh day from the midst of the cloud. 17 And the appearance of the glory of Jehovah as consuming fire upon the head of the, mountain in the eyes of the sons of Israel. 18 And Moses will come into the midst of the cloud, and will go up to the mountain: and Moses will be in the mountain forty days and forty nights.