Exodus 19:10-12

Darby Translation

¹⁰ And Jehovah said to Moses, Go to the people, and hallow them to-day and to-morrow, and let them wash their clothes;

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.

¹² And set bounds round about the people, saying, Take heed to yourselves, [not] to go up unto the mountain nor touch the border of it: whatever toucheth the mountain shall certainly be put to death: