Joshua 7:1, 5, 11-12

But the children of Israel committed a trespass regarding the accursed things, for Achan the son of Carmi, the son of Zabdi, the son of Zerah, of the tribe of Judah, took of the accursed things; so the anger of the LORD burned against the children of Israel.

And the men of Ai struck down about thirty-six men, for they chased them from before the gate as far as Shebarim, and struck them down on the descent; therefore the hearts of the people melted and became like water.

Israel has sinned, and they have also transgressed My covenant which I commanded them. For they have even taken some of the accursed things, and have both stolen and deceived; and they have also put it among their own stuff. Therefore the children of Israel could not stand before their enemies, but turned their backs before their enemies, because they have become doomed to destruction. Neither will I be with you anymore, unless you destroy the accursed from among you.