Joshua 7:1, 5, 11-12

But the sons of Israel acted unfaithfully and violated their obligation in regard to the things [off limits] under the ban [those things belonging to the LORD], for Achan, the son of Carmi, the son of Zabdi, the son of Zerah, from the tribe of Judah, took some of the things under the ban [for personal gain]. Therefore the anger of the LORD burned against the Israelites.

The men of Ai killed about thirty-six of Israel’s men, and chased them from the gate as far as [the bluffs of] Shebarim and struck them down as they descended [the steep pass], so the hearts of the people melted [in despair and began to doubt God’s promise] and became like water (disheartened).

Israel has sinned; they have also transgressed My covenant which I commanded them [to keep]. They have even taken some of the things under the ban, and they have both stolen and denied [the theft]. Moreover, they have also put the stolen objects among their own things. That is why the soldiers of Israel could not stand [and defend themselves] before their enemies; they turned their backs [and ran] before them, because they have become accursed. I will not be with you anymore unless you destroy the things under the ban from among you.