1 Samuel 26:21
“Then said Saul, I have sinned: return, my son David: for I will no more do thee harm, because my soul was precious in thine eyes this day: behold, I have played the fool, and have erred exceedingly.”
Now therefore, I pray thee, let my lord the king hear the words of his servant. If the Lord have stirred thee up against me, let him accept an offering: but if they be the children of men, cursed be they before the Lord; for they have driven me out this day from abiding in the inheritance of the Lord, saying, Go, serve other gods.
Now therefore, let not my blood fall to the earth before the face of the Lord: for the king of Israel is come out to seek a flea, as when one doth hunt a partridge in the mountains.
Then said Saul, I have sinned: return, my son David: for I will no more do thee harm, because my soul was precious in thine eyes this day: behold, I have played the fool, and have erred exceedingly.
And David answered and said, Behold the king’s spear! and let one of the young men come over and fetch it.
The Lord render to every man his righteousness and his faithfulness: for the Lord delivered thee into my hand to day, but I would not stretch forth mine hand against the Lord’s anointed.
Counter-Arguments
The strongest case that this verse does not belong in this theme.

Cross-References
“Therefore if thine enemy hunger, feed him; if he thirst, give him drink: for in so doing thou shalt heap coals of fire on his head.”
“And he said to David, Thou art more righteous than I: for thou hast rewarded me good, whereas I have rewarded thee evil.”
“And Balaam said unto the angel of the Lord, I have sinned; for I knew not that thou stoodest in the way against me: now therefore, if it displease thee, I will get me back again.”
“Then the princes of the Philistines went forth: and it came to pass, after they went forth, that David behaved himself more wisely than all the servants of Saul; so that his name was much set by.”
“And it was told Saul that David was fled to Gath: and he sought no more again for him.”