1 Samuel 24

We learn a great deal of honor and forgiveness with David in his relationship with Saul. Saul was greatly obsessed desire to end the life of David. David knew it and was continually fleeing from Saul. It is apparent that David's fleeing was not that of fear but of honor to the King of Israel. As Saul was delivered into David's hand, even though being justified, David kept his honor saying -

"...The LORD forbid that I should do this thing unto my master, the LORD's anointed, to stretch forth mine hand against him, seeing he is the anointed of the LORD." (Old Testament | 1 Samuel 24:6)

Having already demonstrated that his -

"...heart smote him, because he had cut off Saul's skirt." (Old Testament | 1 Samuel 24:5)

Where we see honor and forgiveness is the words of David the following day as Saul is departing -

"...My lord the king. And when Saul looked behind him, David stooped with his face to the earth, and bowed himself.
9 ¶ And David said to Saul, Wherefore hearest thou men's words, saying, Behold, David seeketh thy hurt?
10 Behold, this day thine eyes have seen how that the LORD had delivered thee to day into mine hand in the cave: and some bade me kill thee: but mine eye spared thee; and I said, I will not put forth mine hand against my lord; for he is the LORD's anointed.
11 Moreover, my father, see, yea, see the skirt of thy robe in my hand: for in that I cut off the skirt of thy robe, and killed thee not, know thou and see that there is neither evil nor transgression in mine hand, and I have not sinned against thee; yet thou huntest my soul to take it."
(Old Testament | 1 Samuel 24:8 - 11)

David's forgiveness had a great affect on Saul, even though it proved to be temporary in that -

"...Saul lifted up his voice, and wept." (Old Testament | 1 Samuel 24:16)

And -

"...said to David, Thou art more righteous than I: for thou hast rewarded me good, whereas I have rewarded thee evil.
18 And thou hast shewed this day how that thou hast dealt well with me: forasmuch as when the LORD had delivered me into thine hand, thou killedst me not.
19 For if a man find his enemy, will he let him go well away? wherefore the LORD reward thee good for that thou hast done unto me this day." (Old Testament | 1 Samuel 24:17 - 19)

It seems when we have the opportunity to take revenge but choose to forgive, greater blessings flow.