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 1:26-28
"And she said, Oh my lord, as thy soul liveth, my lord, I am the woman that stood by thee here, praying unto the Lord. For this child I prayed; and the Lord hath given me my petition which I asked of him: therefore also I have lent him to the Lord; as long as he liveth he shall be lent to the Lord. And he worshipped the Lord there"