1 Samuel 18:1
And it came to pass, when he had made an end of speaking to Saul, that the soul of Jonathan was knit with the soul of David, and Jonathan loved him as his own soul.
Nave's Topical Index—AKJV

1 Samuel 20:16
So Jonathan made a covenant with the house of David, saying, Let the LORD even require it at the hand of David's enemies.
Nave's Topical Index—AKJV