an altar.

1 Corinthians 5:7, 8
Get rid of the old yeast, that you may be a new unleavened batch, as you really are. For Christ, our Passover lamb, has been sacrificed. . . .

1 Corinthians 9:13
Do you not know that those who work in the temple eat of its food, and those who serve at the altar partake of its offerings?

1 Corinthians 10:17, 20
Because there is one loaf, we who are many are one body; for we all partake of the one loaf. . . .

serve.

Numbers 3:7, 8
They are to perform duties for him and for the whole congregation before the Tent of Meeting, attending to the service of the tabernacle. . . .

Numbers 7:5
"Accept these gifts from them, that they may be used in the work of the Tent of Meeting. And give them to the Levites, to every man according to his service."