Sforno on Deuteronomy 13:18/ספורנו על דברים י״ג:י״ח

1ולא ידבק מאומה מן החרם, in order to ensure that such loot not become a stumbling block for you, as when loot of idolaters is retained, something the Torah has forbidden not only in practice, but even the desire to own such loot has been forbidden (Deut. 7,25). We have discussed this matter on that verse.