Joshua 7:1, 5, 11-12

But the Israelites did not obey the LORD. There was a man from the tribe of Judah named Achan. (He was the son of Carmi and grandson of Zabdi, who was the son of Zerah.) Because Achan kept some of the things that were to be given to the LORD, the LORD became very angry at the Israelites.

The people of Ai killed about thirty-six Israelites and then chased the rest from the city gate all the way down to the canyon, killing them as they went down the hill. When the Israelites saw this, they lost their courage.

The Israelites have sinned; they have broken the agreement I commanded them to obey. They took some of the things I commanded them to destroy. They have stolen and lied and have taken those things for themselves. That is why the Israelites cannot face their enemies. They turn away from the fight and run, because I have commanded that they be destroyed. I will not help you anymore unless you destroy everything as I commanded you.