Money from the sale of forbidden objects listed previously is permitted for use and betrothal with it is valid. Why?
Regarding
idolatry it says “you shall not bring it into your house and become
banned like it,” which means that whatever you generate from the sale
of idols is forbidden, but other money is permitted. But maybe this
teaches the rule, not an exception? - No, because there is another
exception where money is forbidden, that is, fruit of the seventh year.
Money from the sale of other items are permitted.