2 Samuel 9:1-7
And David said, Is there yet any that is left of the house of Saul, that I may show him kindness for Jonathan's sake?
Nave's Topical Index—AKJV

2 Samuel 21:7
But the king spared Mephibosheth, the son of Jonathan the son of Saul, because of the LORD's oath that was between them, between David and Jonathan the son of Saul.
Nave's Topical Index—AKJV