1 Samuel 18:3
Then Jonathan and David made a covenant because he loved him as his own soul.
1 Samuel 20:8-17
Therefore, thou shalt deal in mercy with thy slave, for thou hast brought thy slave into a covenant of the LORD with thee; notwithstanding, if there is iniquity in me, slay me thyself, for why should thou bring me to thy father?
1 Samuel 20:42
And Jonathan said to David, Go in peace, forasmuch as we have sworn both of us in the name of the LORD, saying, The LORD be between me and thee and between my seed and thy seed for ever. And he arose and departed, and Jonathan entered into the city.
1 Samuel 23:18
And the two made a covenant before the LORD, and David abode in the woods, and Jonathan returned to his house.
2 Samuel 9:1-3
And David said, Is anyone left of the house of Saul that I may show him mercy for Jonathan's sake?
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.