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 kindly with thy servant; for thou hast brought thy servant into a covenant of the LORD with thee: notwithstanding, if there is in me iniquity, slay me thyself; for why shouldst 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. :43 And he arose and departed: and Jonathan went into the city.
1 Samuel 23:18
And they two made a covenant before the LORD: and David abode in the wood, and Jonathan went to his house.
2 Samuel 9:1-3
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?
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.