יורה דעה קמ״דYoreh De'ah 144

Se’if 1א׳

דְּמֵי עֲבוֹדַת כּוֹכָבִים בְּיַד יִשְׂרָאֵל שֶׁמְּכָרָהּ, אֲסוּרִים. אֲבָל אִם מְכָרָהּ עוֹבֵד כּוֹכָבִים, אֲפִלּוּ מְכָרָהּ כְּדֵי לְעָבְדָהּ, הַדָּמִים מֻתָּרִים. וְדַוְקָא שֶׁהַדָּבָר יָדוּעַ שֶׁמְּכָרָהּ לַעֲשׂוֹת צְרָכָיו בְּדָמֶיהָ, אֲבָל אִם אֵינוֹ יָדוּעַ, יֵשׁ לָחוּשׁ שֶׁמָּא מְכָרָהּ לִקְנוֹת בְּדָמֶיהָ עֲבוֹדַת כּוֹכָבִים אֲחֵרִים, וַהֲרֵי הַמָּעוֹת מֻקְצִין לַעֲבוֹדַת כּוֹכָבִים, וַאֲסוּרִים. וְעַיֵּן לְעֵיל סוֹף סִימָן קל"ב.

The price of an idol in the hand of an Israelite who sold it is forbidden. But if an idolater (oved kokhavim — the standing term for a gentile) sold it, the money is permitted, even if he sold it in order that it be worshipped. And that is specifically where the matter is known, that he sold it to meet his own needs with its price; but if it is not known, there is ground for concern lest he sold it in order to buy other idols with its price, and the money is then set aside for an idol and is forbidden. And see above, the end of siman 132.

Se’if 2ב׳

יֵשׁ אוֹמְרִים שֶׁאִם בְּיַד יִשְׂרָאֵל יַיִן נֶסֶךְ וַעֲבוֹדַת כּוֹכָבִים, וּמְכָרָם לְעוֹבֵד כּוֹכָבִים בְּהַקָּפָה (פֵּרוּשׁ בְּהַמְתָּנָה), וּמְכָרָם הָעוֹבֵד כּוֹכָבִים לְאַחֵר קֹדֶם שֶׁיִּפְרַע לְזֶה הַיִּשְׂרָאֵל, הַדָּמִים מֻתָּרִים בְּדִיעֲבַד.

There are those who say that if an Israelite has in his hand yayin nesach (wine poured out as an idolatrous libation) and an idol, and he sold them to an idolater on credit (that is, with the payment deferred), and the idolater sold them to another before he paid this Israelite, the money is permitted after the fact.