Joshua 7:1 (KJV)
7 But the children of Israel committed a trespass in the accursed thing: for Achan, the son of Carmi, the son of Zabdi, the son of Zerah, of the tribe of Judah, took of the accursed thing: and the anger of the Lord was kindled against the children of Israel.

It is certain that one only was guilty; and yet the trespass is imputed here to the whole congregation; and the whole congregation soon suffered shame and disgrace on the account, as their armies were defeated, thirty-six persons slain, and general terror spread through the whole camp. Being one body, God attributes the crime of the individual to the whole till the trespass was discovered, and by a public act of justice inflicted on the culprit the congregation had purged itself of the iniquity. This was done to render every man extremely cautious, and to make the people watchful over each other, that sin might be no where tolerated or connived at, as one transgression might bring down the wrath of God upon the whole camp