Exodus 19:11

And let them be ready against the third day, for on the third day the Lord will descend upon mount Sina before all the people.

And be ready against the third day: for the third day the Lord will come down in the sight of all the people upon mount Sinai.

and be ready for the third day; for on the third day Yahweh will come down in the sight of all the people on Mount Sinai.