Joshua 7:12-13

12Therefore the children of Israel cannot stand before their enemies, they turn their backs before their enemies, because they are become accursed: I will not be with you any more, except ye destroy the devoted thing from among you.

13Up, sanctify the people, and say, Sanctify yourselves against tomorrow: for thus saith the LORD, the God of Israel, There is a devoted thing in the midst of thee, O Israel: thou canst not stand before thine enemies, until ye take away the devoted thing from among you.