Deuteronomy 9:9-11

9When I went up the mountain to receive the tablets of stone, the tablets of the covenant that Adonai cut with you, I stayed on the mountain 40 days and 40 nights; I did not eat bread or drink water.

10Adonai gave me the two tablets of stone written by the finger of God. Moreover, on them were all the words that Adonai had spoken with you on the mountain from the midst of the fire, on the day of the assembly.

11“Now at the end of 40 days and 40 nights, Adonai gave me the two tablets of stone—the tablets of the covenant.