'Service' in the Bible

Now Eli was very old; and he heard all that his sons did unto all Israel, and how that they lay with the women that did service at the door of the tent of meeting.

Strengthen yourselves, and become men, O Philistines, lest ye do service to Hebrews, as they have done to you -- then ye have become men, and have fought.'

There was intense fighting against the Philistines during Saul's entire reign, and whenever Saul discovered a strong or valiant warrior, he would enlist him for service.

When David came to Saul and entered his service, Saul admired him greatly, and David became his armor-bearer.

Then Saul sent word to Jesse: “Let David remain in my service, for I am pleased with him.”

The men of Israel said, “Have you seen this man who is coming up? Surely he is coming up to defy Israel. The king will reward the man who kills him with great riches, and will give him his daughter [in marriage] and make his father’s house (family) free [from taxes and service] in Israel.”

Then Jonathan spoke well of David to Saul his father and said to him, “May the king not sin against his servant David, since he has not sinned against you, and since his deeds have been very beneficial to you.

Then Saul said, “Listen, son of Ahitub!”“I’m at your service, my lord,” he said.

Then David said to Achish, "But what have I done? And what have you found in your servant from the day that I {entered your service} until this day, that I should not go and fight against the enemies of my lord the king?"