Exodus 19:10, 15, 22
Exodus 19:10 NKJV
Then the LORD said to Moses, “Go to the people and consecrate them today and tomorrow, and let them wash their clothes.
Exodus 19:15 NKJV
And he said to the people, “Be ready for the third day; do not come near your wives.”
Exodus 19:22 NKJV
Also let the priests who come near the LORD consecrate themselves, lest the LORD break out against them.”