Moses went into the cloud when he went up ¹  the mountain, and Moses was on the mountain forty days and forty nights. ² 

Now the Israelites ate manna forty years, until they came to a land that was inhabited; they ate manna until they came to the border of the land of Canaan.

So he was there with the Lord forty days and forty nights; ¹  he did not eat bread, and he did not drink water. He wrote on the tablets the words of the covenant, the ten commandments. ²