NET
11 and 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.
Darby
11 and let them be ready for the third day; for on the third day Jehovah will come down before the eyes of all the people on mount Sinai.
KJV
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.