So Joshua said, "Roll large stones against the mouth of the cave, and set men by it to guard them.
Joshua 10:18
Surrounding context
10:17 And it was told Joshua, saying, "The five kings have been found hidden in the cave at Makkedah."
10:18 So Joshua said, "Roll large stones against the mouth of the cave, and set men by it to guard them.
10:19 And do not stay there yourselves, but pursue your enemies, and attack their rear guard. Do not allow them to enter their cities, for the LORD your God has delivered them into your hand."