'Serving' in the Bible

Now it happened while Zacharias was serving as priest before God in the appointed order of his priestly division,

Some soldiers asked him, “And what about us, what are we to do?” And he replied to them, “Do not extort money from anyone or harass or blackmail anyone, and be satisfied with your wages.”

But Martha was very busy and distracted with all of her serving responsibilities; and she approached Him and said, “Lord, is it of no concern to You that my sister has left me to do the serving alone? Tell her to help me and do her part.”