They made a big pile of rocks over him. It is still there now. Then God was not mad anymore. The place is called the Valley of Achor (Trouble) to this day. ️
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.
KJV
And they raised over him a great heap of stones unto this day. So the LORD turned from the fierceness of his anger. Wherefore the name of that place was called, The valley of Achor, unto this day.
ASV
And they raised over him a great heap of stones, unto this day; and Jehovah turned from the fierceness of his anger. Wherefore the name of that place was called, The valley of Achor, unto this day.