'On the Third Day' in the Bible

and shall be ready, by the third day, - for on the third day, will Yahweh come down in the sight of all the people upon Mount Sinai.

And it came to pass on the third day, when the morning had come, that there were thunderings and lightnings, and a heavy cloud upon the mount, and the sound of a horn, loud exceedingly, - and all the people who were in the camp trembled.