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!