λειτουργέω

Acts 13:2 λειτουργούντων As were ministering

While they were worshiping the Lord and fasting, the Holy Spirit said, “Set apart for Me Barnabas and Saul for the work to which I have called them.”

Romans 15:27 λειτουργῆσαι to minister

They were pleased to do it, and indeed they owe it to them. For if the Gentiles have shared in their spiritual blessings, they are obligated to minister to them with material blessings.

Hebrews 10:11 λειτουργῶν ministering

Day after day every priest stands to minister and to offer again and again the same sacrifices, which can never take away sins.