'Third Day' in the Bible

and let them be ready for 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 ready for the third day; do not go near a woman.”

So it came about on the third day, when it was morning, that there were thunder and lightning flashes and a thick cloud upon the mountain and a very loud trumpet sound, so that all the people who were in the camp trembled.