Exodus 19:10, 15, 22

The LORD also said to Moses, “Go to the people and consecrate them today and tomorrow [that is, prepare them for My sacred purpose], and have them wash their clothes

He said to the people, “Be prepared for the third day; do not be intimate with a woman.”

Also have the priests who approach the LORD consecrate (sanctify, set apart) themselves [for My sacred purpose], or else the LORD will break forth [in judgment] against them [and destroy them].”