Exodus 19:13 DBY

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:

¹³  not a hand shall touch it, but it shall certainly be stoned, or shot through; whether it be a beast or a man, it shall not live. When the long drawn note of the trumpet soundeth, they shall come up to the mountain.

¹⁴  And Moses came down from the mountain to the people, and hallowed the people; and they washed their clothes.

¹⁵  And he said to the people, Be ready for the third day; do not come near [your] wives.