'Serving' in the Bible

which is a simile in regard to the present time, in which both gifts and sacrifices are offered, which are not able, in regard to conscience, to make perfect him who is serving,

since, would they not have ceased to be offered, because of those serving having no more conscience of sins, having once been purified?

and every priest, indeed, hath stood daily serving, and the same sacrifices many times offering, that are never able to take away sins.

we have an altar, of which to eat they have no authority who the tabernacle are serving,