Read 1 Samuel 16:21 Using Other Translations
And David came to Saul, and stood before him: and he loved him greatly; and he became his armourbearer.
And David came to Saul and entered his service. And Saul loved him greatly, and he became his armor-bearer.
So David went to Saul and began serving him. Saul loved David very much, and David became his armor bearer.