1 Samuel 18:3
And Jonathan and David bound themselves the one to the other, for Jonathan loved him as his own soul.
1 Samuel 20:8-17
And then thou shalt show mercy unto thy servant, for thou hast made with me thy servant a bond in the LORD. Notwithstanding, if there be in me any trespass, then slay me thyself, for what needeth thee to bring me to thy father?"
1 Samuel 20:42
And Jonathan said unto David, "Go thy way in peace. Whatsoever we both have sworn and spoken together in the name of the LORD, the LORD be witness between me and thee, and between my seed and thine forever." And Jonathan gat him up, and came into the city.
1 Samuel 23:18
And they made a bond both of them together before the LORD. And David tarried still in the thicket, and Jonathan went to his house.
2 Samuel 9:1-3
Then said David, "Is there yet any man left of the house of Saul, that I may show him mercy for Jonathan's sake?"
2 Samuel 21:7
But the king had compassion on Mephibosheth, the son of Jonathan, the son of Saul, because of the LORD's oath that was between them: that is to say, between David and Jonathan the son of Saul.