Parshas Tetzaveh begins with the words, וְאַתָּה תְּצַוֶּה אֶת-בְּנֵי יִשְׂרָאֵל, וְיִקְחוּ אֵלֶיךָ שֶׁמֶן זַיִת זָךְ כָּתִית--לַמָּאוֹר לְהַעֲלֹת נֵר, תָּמִיד And you will command the children of Israel, that they will bring you pure olive oil, pressed to be burned, to be lit, eternally. Why first of all is the entire Jewish people being directed in the performance of the mitzvah of providing oil for the menorah, which is lit by the Kohanim. Secondly, why do we need Shemen Zayit Zach Katit, pure olive oil of only the first drop of oil squeezed from the olive, if it's only going to be burned anyway. The answer to that is in the rest of the pasuk. Lehaalot Ner Tamid, we need only the purest oil for it to create a truly eternal light. The Kohanim were expected to set an example in the purity of their behavior, down to the smallest of details. That is why their elevation is described as Kaper, a word usually used for atonement, because their elevation requires them to achiev