"B ’rov am hadras Melech,” the concept that the glory of the King is magnified when served by multitudes united in His service, is expressed both in a verse in Mishlei (14:28) and in a halachic requirement. Based on this verse and the one stating that the korban Minchah be brought to the sons of Aharon, the Midrash Rabbah (Vayikra 3:6) states that the bringing of a korban Minchah in the Beis Hamikdash must involve many Kohanim. This implies that in the view of the Midrash, glorifying Hashem by serving Him en masse may be a biblical requirement.