'Sanctify' in the Bible

Joshua said to the people, "Sanctify yourselves; for tomorrow Yahweh will do wonders among you."

"Get up! Sanctify the people, and say, 'Sanctify yourselves for tomorrow, for Yahweh, the God of Israel, says, "There is a devoted thing in the midst of you, Israel. You cannot stand before your enemies until you take away the devoted thing from among you."