'Rocks' in the Bible

and raised over him a large pile of rocks that remains to this day. Then the Lord turned from His burning anger. Therefore that place is called the Valley of Achor to this day.

He hung the body of the king of Ai on a tree until evening, and at sunset Joshua commanded that they take his body down from the tree. They threw it down at the entrance of the city gate and put a large pile of rocks over it, which remains to this day.