'Serve' in the Bible

and the hangings of the court, and the screen for the door of the gate of the court, which is by the tabernacle and around the altar, and their cords, and all the instruments of their service, and whatever shall be done with them. Therein shall they serve.

and from the age of fifty years they shall cease waiting on the work, and shall serve no more,

You and your sons with you shall keep your priesthood for everything of the altar, and for that within the veil; and you shall serve: I give you the priesthood as a service of gift: and the stranger who comes near shall be put to death."

"To the children of Levi, behold, I have given all the tithe in Israel for an inheritance, in return for their service which they serve, even the service of the Tent of Meeting.