ויאמר משה אל אהרן קרב אל המזבח ועשה את חטאתך ואת עולתך
Chazal (Toras Kohanim) teach that Moshe Rabbeinu had to coerce Aharon to participate in the holy service. Apparently, he was reluctant to approach the Mizbayach, Altar, because he saw the image of an eigal, calf, on top of the Mizbayach. The calf brought to mind his participation in the sin of the Golden Calf. As a result, he was self-conscious concerning coming forward and taking his rightful position at the Mizbayach. Moshe Rabbeinu noticed Aharon’s hesitancy and said, “Why are you embarrassed to go forward and serve? Indeed, l’kach nivcharta, it is specifically because of your extraordinary humility that you…