Charles Ellicott Commentary Deuteronomy 7:25-26

"The graven images of their gods shall ye burn with fire: thou shalt not covet the silver or the gold that is on them, nor take it unto thee, lest thou be snared therein; for it is an abomination to Jehovah thy God. And thou shalt not bring an abomination into thy house, and become a devoted thing like unto it: thou shalt utterly detest it, and thou shalt utterly abhor it; for it is a devoted thing." — Deuteronomy 7:25-26 (ASV)

These words are a special warning against the sin which Achan committed (Joshua 7:21): I coveted them, and took them. They also describe the consequences which he experienced, together with his whole household, being made chêrem. devoted or accursed by the spoil which he took from Jericho.