1 Samuel 24:17-21

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

18You have declared today that you have done good to me, that 3the Lord handed me over to you and yet you did not kill me.

19Though if a man 4finds his enemy, will he let him go away 5unharmed? 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 certainly 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 eliminate my name from my father’s household.”