Read Exodus 19:10 Using Other Translations
And the LORD said unto Moses, Go unto the people, and sanctify them to day and to morrow, and let them wash their clothes,
the LORD said to Moses, "Go to the people and consecrate them today and tomorrow, and let them wash their garments
Then the LORD told Moses, “Go down and prepare the people for my arrival. Consecrate them today and tomorrow, and have them wash their clothing.