Genesis 7:4 New International Version (NIV)

⁴ Seven days from now I will send rain on the earth for forty days and forty nights, and I will wipe from the face of the earth every living creature I have made.”

Deuteronomy 9:9-12 New International Version (NIV)

⁹ When I went up on the mountain to receive the tablets of stone, the tablets of the covenant that the Lord had made with you, I stayed on the mountain forty days and forty nights; I ate no bread and drank no water. ¹⁰ The Lord gave me two stone tablets inscribed by the finger of God. On them were all the commandments the Lord proclaimed to you on the mountain out of the fire, on the day of the assembly.

¹¹ At the end of the forty days and forty nights, the Lord gave me the two stone tablets, the tablets of the covenant. ¹² Then the Lord told me, “Go down from here at once, because your people whom you brought out of Egypt have become corrupt. They have turned away quickly from what I commanded them and have made an idol for themselves.”