Devarim 13:18-19 (17-18)
18 (17) Velo-yidbak beyadecha me’umah min-hacherem lema’an yashuv YHVH mecharon apo venatan-lecha rachamim verichamecha vehirbecha ka’asher nishba la’avoteycha.
There shall cleave nothing of the devoted thing to your hand; that YHVH may turn from the fierceness of his anger, and show you mercy, and have compassion on you, and multiply you, as he has sworn to your fathers;
19 (18) Ki tishma bekol YHVH Eloheycha lishmor et-kol-mitsvotav asher anochi metsavecha hayom la’asot hayashar be’eyney YHVH Eloheycha.
when you shall listen to the voice of YHVH your Elohim, to keep all his mitzvot which I command you this day, to do that which is right in the eyes of YHVH your Elohim.

This relates to the Nidachat (apostate lead astray to idolatry) city. The word for devoted thing is cherem. It means something prohibited for common use, something set apart for destruction. We are prohibited from keeping anything from the Nidachat city. The object doesn't necessarily have to do anything with an idol. No spoil at all is to be taken from the city. Everything is to completely destroyed

Devarim (Deuteronomy) 7:26
You shall not bring an abomination into your house, and become a cherem like it: you shall utterly detest it, and you shall utterly abhor it; for it is a cherem.

We see an example of this mitzvah in Sefer Yehoshua (Joshua). When they destroyed Yericho (Jericho) Yehoshua (Joshua) told the people, "And keep yourselves from the accursed thing, lest ye make yourselves accursed, when ye take of the accursed thing, and make the camp of Yisra'el a curse, and trouble it. (Yehoshua 6:18).

Yehoshua (Joshua 7:1)
But the children of Yisra’el committed a trespass in the accursed thing; for ‘Akhan, the son of Karmi, the son of Zavdi, the son of Zerach, of the tribe of Yehudah, took of the accursed thing: and the anger YHVH was kindled against the children of Yisra’el.

Later, we find out what it was that Akhan took:

Akhan answered Yehoshua, and said, Of a truth I have sinned against YHVH, Elohim of Yisra’el, and thus and thus have I done: when I saw among the spoil a goodly mantle of Shin‘ar, and two hundred shekels of silver, and a wedge of gold of fifty shekels weight, then I coveted them, and took them; and, behold, they are hid in the earth in the midst of my tent, and the silver under it." (Joshua 7:20-21).

By themselves, these things were not particularly wrong, except they came from a city that was to be utterly destroyed.

Ya'akov (James) 1:27
The religious observance that God the Father considers pure and faultless is this: to care for orphans and widows in their distress and to keep oneself from being contaminated by the world.

1 Yochanan/John 2:16-17
because all the things of the world—the desires of the old nature, the desires of the eyes, and the pretensions of life—are not from the Father but from the world. And the world is passing away, along with its desires. But whoever does God’s will remains forever.

Rather, as it said in Devarim 13:19 (18), we should listen and obey what YHVH says.