Reference for Avodah Zarah 67:3

וכ"ת חמץ דאורייתא יין נסך דרבנן והא כל דתקון רבנן כעין דאורייתא תקון זה תשמישו בחמין וזה תשמישו בצונן

And should you say that hametz [on Pesah] is forbidden by the Torah, whereas idolatrous wine is merely a rabbinic prohibition, whatever the Rabbis enacted they enacted it to be like the Torah! This is used for hot and this is used for cold.

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