'Nights' in the Bible

When I was gone up into the mount to receive the tables of stone, even the tables of the covenant which Jehovah made with you, then I abode in the mount forty days and forty nights; I did neither eat bread nor drink water.

And it came to pass at the end of forty days and forty nights, that Jehovah gave me the two tables of stone, even the tables of the covenant.

And I fell down before Jehovah, as at the first, forty days and forty nights; I did neither eat bread nor drink water; because of all your sin which ye sinned, in doing that which was evil in the sight of Jehovah, to provoke him to anger.

So I fell down before Jehovah the forty days and forty nights that I fell down, because Jehovah had said he would destroy you.

And I stayed in the mount, as at the first time, forty days and forty nights: and Jehovah hearkened unto me that time also; Jehovah would not destroy thee.