THEOSISTheodoret of Cyrus
What responsibilities were assigned to the priests and the Levites? This is revealed by the Lord Himself. For it is stated, "The Lord spake unto Moses, saying, Feed the tribe of Levi, and set me before Aaron a priest, and let them serve him: and let his watchmen, and the watchmen of the children of Israel, shoot before the tabernacle of the vision, to do the work of the tabernacle: And let them keep all the vessels of the tabernacle of the vision, and the guards of the children of Israel, and all the works of the tabernacle: and let the Levites be given unto Aaron thy brother, and unto his sons the priests: as a gift these were given unto me of the children of Israel.
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And thou shalt set Aaron and his sons over the tabernacle, and let them keep their priesthood, and all that are by the altar, and within the veil: but the foreigner that toucheth them shall die" (Num. 3: 5-10). From this passage, we understand that the priests were charged with making offerings, while the Levites were designated as assistants to the priests and keepers of the Tabernacle. In the subsequent verses, Moses outlines what garments were to be worn by the descendants of Caath, Gershon, and Merari.