1 Samuel 24:17-21

171He said to David, “You are more righteous than I; for 2you have dealt well with me, while I have dealt wickedly with you.

18You have declared today that you have done good to me, that 3the Lord delivered me into your hand and yet you did not kill me.

19For if a man 4finds his enemy, will he let him go away 5safely? May the Lord therefore reward you with good in return for what you have done to me this day.

20Now, behold, 6I know that you will surely be king, and that 7the kingdom of Israel will be established in your hand.

21So now 8swear to me by the Lord that you will not cut off my 9descendants after me and that you will not destroy my name from my father’s household.”