Reference for Menachot 172:1
<big><strong>גמ׳</strong></big> שוין והא אמרת ראשון למנורה והשאר למנחות אמר רב נחמן בר יצחק מאי שוין שוין למנחות:
<big><b>GEMARA: </b></big>ARE EQUAL! [But is this possible? ] Have you not said, 'The first kind is fit for the candlestick and the others for meal-offerings'?<span class="x" onmousemove="('comment',' Thus the second kind of oil of the first crop is not fit for the candlestick but only for meal-offerings, whereas the first kind of oil of the second crop is fit even for the candlestick!');"><sup>1</sup></span> - R'Nahman B'Isaac answered, The statement ARE EQUAL means that they are equal in respect of meal-offerings.<span class="x" onmousemove="('comment',' I.e., they are of equal quality. and if a man has to bring a meal-offering he may bring with it either kind of oil.');"><sup>2</sup></span> BY RIGHT IT COULD BE INFERRED BY THE FOLLOWING ARGUMENT THAT MEAL-OFFERINGS etc. Our Rabbis taught:[It is written.] 'Pure'; [and the expression] 'pure' means nothing else but clear.<span class="x" onmousemove="('comment',' I.e., the oil which oozes by itself from the olives without any pressure being applied.');"><sup>3</sup></span>