Exodus 34:28
And he was there with the LORD forty days and forty nights; he did neither eat bread, nor drink water. And he wrote on the tables the words of the covenant, the ten commandments.
Nave's Topical Index—AKJV

Deuteronomy 5:2,3
The LORD our God made a covenant with us in Horeb.
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Deuteronomy 9:9
When I was gone up into the mount to receive the tables of stone, even the tables of the covenant which the LORD made with you, then I stayed in the mount forty days and forty nights, I neither did eat bread nor drink water:
Nave's Topical Index—AKJV