Exodus 19:14

So Jacob said to his household and to all who were with him, “Put away the foreign gods which are among you and cleanse yourselves and change your garments;

And David answered the priest and said to him, “Surely women have been kept from us as previously when I set out and the vessels of the young men were holy, though it was an ordinary journey; how much more then today will their vessels be holy?”

and said to them, “You are the heads of the fathers’ households of the Levites; set yourselves apart as holy, both you and your relatives, that you may bring up the ark of Yahweh, the God of Israel, to the place that I have prepared for it.