משנה אויף שמות 27:20

The first oil of the first crop, there is none better than it. The second oil of the first crop and the first oil of the second crop are equal. The third oil of the first crop, the second oil of the second crop and the first oil of the third crop are equal. The third oil of the second crop and the second oil of the third crop are equal. As to the third oil of the third crop, there is none worse than it. It would have been logical by the following argument that menahot should also require the purest olive oil: if the candlestick, whose [oil] is not for eating, requires pure olive oil, how much more should menahot, whose oil is for eating, require pure olive oil! But the text states, “Pure olive oil of beaten olives for lighting” (Exodus 27:20), but not “pure olive oil of beaten olives for menahot.”