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 deal kindly with your servant; for you have brought your servant into a covenant of Yahweh with you: but if there be in me iniquity, kill me yourself; for why should you bring me to your father?"
1 Samuel 20:42
Jonathan said to David, "Go in peace, because we have both sworn in the name of Yahweh, saying, 'Yahweh shall be between me and you, and between my seed and your seed, forever.'" He arose and departed; and Jonathan went into the city.
1 Samuel 23:18
They both made a covenant before Yahweh: and David stayed in the woods, and Jonathan went to his house.
2 Samuel 9:1-3
David said, "Is there yet any who is left of the house of Saul, that I may show him kindness for Jonathan's sake?"
2 Samuel 21:7
But the king spared Mephibosheth, the son of Jonathan the son of Saul, because of Yahweh's oath that was between them, between David and Jonathan the son of Saul.