Exodus 19:15

he said to them, "Be prepared on the third day, and do not draw near to your wives.

Other versions

King James Version

And he said unto the people, Be ready against the third day: come not at your wives.

English Standard Version

And he said to the people, "Be ready for the third day; do not go near a woman."

New International Version

Then he said to the people, "Prepare yourselves for the third day. Abstain from sexual relations."