'Third Day' in the Bible

and be prepared by the third day, for on the third day the Lord will come down on Mount Sinai in the sight of all the people.

He said to the people, “Be prepared by the third day. Do not have sexual relations with women.”

On the third day, when morning came, there was thunder and lightning, a thick cloud on the mountain, and a loud trumpet sound, so that all the people in the camp shuddered.