'Menial' in the Bible

They shall join you and attend to the duties of the Tent of Meeting—all the service of the tent—and no stranger [no layman, anyone who is not a Levite] may approach you [and your sons].

Behold, I Myself have taken your fellow Levites from among the sons of Israel; they are a gift to you, given (dedicated) to the Lord, to do the service for the Tent of Meeting (tabernacle).

“Behold, I have given the Levites all the tithe in Israel as an inheritance, in return for their service which they perform, the service of the Tent of Meeting (tabernacle).

Only the Levites shall perform the service of the Tent of Meeting (tabernacle), and they shall bear their iniquity; it shall be a statute forever throughout your generations, that the Levites shall have no inheritance [of land] among the children of Israel.