# said to his household

"said to his family"

# Get rid of the foreign gods that are among you

"Throw away your idols" or "Get rid of your false gods"

# purify yourselves, and change your clothes

This was the custom of cleansing oneself morally and physically before going to worship God.

# change your clothes

Putting on a new clothes was a sign that they had made themselves clean before approaching God.