they took

Joshua 8:29
He hung the body of the king of Ai on a tree until evening, and at sunset Joshua commanded that they take down the body from the tree and throw it down at the entrance of the city gate. And over it they raised a large pile of rocks, which remains to this day.

Deuteronomy 21:23
you must not leave the body on the tree overnight, but you must be sure to bury him that day, because anyone who is hung on a tree is under God's curse. You must not defile the land the LORD your God is giving you as an inheritance.

2 Samuel 18:17
They took Absalom, cast him into a large pit in the forest, and piled a huge mound of stones over him. Meanwhile, all the Israelites fled, each to his home.

until this very day

Joshua 4:9
Joshua also set up twelve stones in the middle of the Jordan, in the place where the priests who carried the ark of the covenant were standing. And the stones are there to this day.

Joshua 7:26
And they heaped over Achan a large pile of rocks that remains to this day. So the LORD turned from His burning anger. Therefore that place is called the Valley of Achor to this day.