1 Samuel 18:15 KJV

Wherefore when Saul saw that he behaved himself very wisely, he was afraid of him.
1 Samuel 18:15, King James Version

In context

14 And David behaved himself wisely in all his ways; and the Lord was with him.

15 Wherefore when Saul saw that he behaved himself very wisely, he was afraid of him.

16 But all Israel and Judah loved David, because he went out and came in before them.