Exodus Chapter 19, Verse 11

11: 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.- edit KJV text
11: And let them be ready against the third day; for on the third day the Lord will come down in the sight of all the people, upon Mount Sinai.— edit Douay text
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.— edit LXX text