'Purpose' in the Bible

Then Joshua said to the people, “Sanctify yourselves [for His purpose], for tomorrow the Lord will do wonders (miracles) among you.”

Rise up! Consecrate the people and say, ‘Consecrate yourselves for tomorrow, for thus says the Lord, the God of Israel: “There are things under the ban among you, O Israel. You cannot stand [victorious] before your enemies until you remove the things under the ban from among you.”