1 Samuel 18:29-30 New King James Version (NKJV)

29. and Saul was still more afraid of David. So Saul became David’s enemy continually.

30. Then the princes of the Philistines went out to war. And so it was, whenever they went out, that David behaved more wisely than all the servants of Saul, so that his name became highly esteemed.

1 Samuel 18