1 Samuel 18:13 (KJV)

And Saul was very wroth, and the saying displeased him; and he said, They have ascribed unto David ten thousands, and to me they have ascribed but thousands: and what can he have more but the kingdom?

And Saul eyed David from that day and forward.

And it came to pass on the morrow, that the evil spirit from God came upon Saul, and he prophesied in the midst of the house: and David played with his hand, as at other times: and there was a javelin in Saul's hand.

And Saul cast the javelin; for he said, I will smite David even to the wall with it. And David avoided out of his presence twice.

And Saul was afraid of David, because the LORD was with him, and was departed from Saul.

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

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

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

And Saul said to David, Behold my elder daughter Merab, her will I give thee to wife: only be thou valiant for me, and fight the LORD's battles. For Saul said, Let not mine hand be upon him, but let the hand of the Philistines be upon him.

And David said unto Saul, Who am I? and what is my life, or my father's family in Israel, that I should be son in law to the king?