Deuteronomy 17:11

עַל פִּי הַתּוֹרָה אֲשֶׁר יוֹרוּךָ וְעַל הַמִּשְׁפָּט אֲשֶׁר יֹאמְרוּ לְךָ תַּעֲשֶׂה לֹא תָסוּר מִן הַדָּבָר אֲשֶׁר יַגִּידוּ לְךָ יָמִין וּשְׂמֹאל

According to the law they will teach you and the judgment they will tell you, so shall you do; you shall not deviate from the matter they will say to you, neither right nor left.

When we light the menorah, we recite a bracha that G-d commanded us to kindle the Chanukah lights. The Talmud in Shabbos (23a) asks the logical question: the Chanukah story occurred many, many centuries after the Torah was given. Where did G-d ever command us to light candles on it? Two answers to this question are given. The first, from Rav Avya, is this verse, in which the Torah commands us to observe rabbinically-instituted laws. Lighting the menorah fulfills our Torah obligation to follow rabbinic laws!