'Serve' in the Bible

No one brings grain offerings or drink offerings to the temple of the Lord anymore. So the priests, those who serve the Lord, are in mourning.

Who knows whether He will relent [and revoke your sentence],And leave a blessing behind Him,Even a grain offering and a drink offering [from the bounty He provides you]For the Lord your God?

As they serve between the porch and the altar, let the priests and ministers of the LORD weep and pray: "Spare your people, LORD, and do not make your heritage a disgrace so that nations ridicule them. Why should they say among the people, "Where is their God?"'"