The first two kings, Saul and David, feature prominently in the first book of Samuel.
The First Book of Samuel is the ninth book in the Bible. It tells us about the prophet Samuel and the transition of Israel from the rule of Judges to that of Kings.
I Samuel 3:10-13
"And the Lord came, and stood, and called as at other times, Samuel, Samuel. Then Samuel answered, Speak; for thy servant heareth. And the Lord said to Samuel, Behold, I will do a thing in Israel, at which both the ears of every one that heareth it shall tingle. In that day I will perform against Eli all things which I have spoken concerning his house: when I begin, I will also make an end. For I have told him that I will judge his house for ever for the iniquity which he knoweth; because his sons made themselves vile, and he restrained them not"