What terrible punishment happened to Achan and his family when he was caught with some devoted plunder?

ANSWER

Achan and his family were stoned and burned

Joshua 7 :

24 Then Joshua, together with all Israel, took Achan son of Zerah, the silver, the robe, the gold bar, his sons and daughters, his cattle, donkeys and sheep, his tent and all that he had, to the Valley of Achor. 25 Joshua said, “Why have you brought this trouble on us? The LORD will bring trouble on you today.” Then all Israel stoned him, and after they had stoned the rest, they burned them. 26 Over Achan they heaped up a large pile of rocks, which remains to this day. Then the LORD turned from his fierce anger. Therefore that place has been called the Valley of Achor ever since.
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