'Nights' in the Bible

Then I went up to the mountain to receive the two stone Tablets of the Covenant that the LORD had established with you. I stayed on the mountain for 40 days and nights without eating food or drinking water.

At the end of 40 days and nights, the LORD gave to me the two stone Tablets of the Covenant.

I fell down in the LORD's presence, just as I had the first 40 days and nights. I did not eat food or drink water because of your sin. You had sinned by committing this evil in the sight of the LORD, thereby provoking him to anger.

I fell down in the LORD's presence for 40 days and nights, because the LORD said he was ready to destroy you.

When I stood on the mountain for 40 days and 40 nights as I did the first time, the LORD listened to me once again. The LORD was not willing to destroy you.