Joshua 7:12-13

12Therefore the children of Israel could not stand before their enemies, but turned their backs before their enemies, because they were accursed: neither will I be with you any more, except ye destroy the accursed from among you.

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