Joshua 10: 17-19

You can't keep any sin,

you have to take them all out like the Canaanite kings from the cave 

and hang them in the sun!

And it was told Joshua, saying. The five kings are found hid in a cave at Makkedah.

And Joshua said, Roll great stones upon the mouth of the cave, and set men by it for keep them:

And stay ye not, but pursue after your enemies, and smite the hindmost of them: suffer them not to enter into their cities:

For the LORD your God hath delivered them into your hand.

Joshua 10:17-19