Reference for Sukkah 67:9

אמר רב חסדא הני תלת מילי אשתני שמייהו מכי חרב בית המקדש חלפת' ערבתא ערבתא חלפתא מאי נ"מ ללולב

R. Hisda said: Since the destruction of the Temple the following three things have had their names interchanged: [What was called] halafta [is now called] aravta, and what was called aravta, is now called halafta. What is the practical significance of this? With regard to the lulav.

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