Joshua 7:1-5

But the sons of Israel acted unfaithfully regarding the things designated for destruction, for Achan, the son of Carmi, the son of Zabdi, the son of Zerah, from the tribe of Judah, took some of the designated things; therefore the anger of the Lord burned against the sons of Israel.

Now Joshua sent men from Jericho to Ai, which is near Beth-aven, east of Bethel, and said to them, “Go up and spy out the land.” So the men went up and spied out Ai.

Then they returned to Joshua and said to him, “Do not have all the people go up; have only about two or three thousand men go up and attack Ai; do not trouble all the people there, for they are few.”

So about three thousand men from the people went up there, but they fled from the men of Ai.

And the men of Ai struck and killed about thirty-six of their men, and pursued them from the gate as far as Shebarim and struck them on the mountainside; and the hearts of the people melted and became like water.