1 Samuel 18:3
Then Jonathan made a covenant with David because he loved him as himself.

1 Samuel 20:8
Therefore deal faithfully with your servant, for you have brought me into a covenant with you before the LORD. If there is iniquity in me, then kill me yourself; why should you bring me to your father?"

1 Samuel 20:12
and Jonathan said, "By the LORD, the God of Israel, I will sound out my father by this time tomorrow or the next day. If he is favorable toward you, will I not send for you and tell you?

1 Samuel 20:42
And Jonathan said to David, "Go in peace, for the two of us have sworn in the name of the LORD when we said, 'May the LORD be a witness between you and me, and between your descendants and mine forever.'" Then David got up and departed, and Jonathan went back into the city.

2 Samuel 9:1
Then David asked, "Is there anyone left from the house of Saul to whom I can show kindness for the sake of Jonathan?"

2 Samuel 21:7
Now the king spared Mephibosheth son of Jonathan, the son of Saul, because of the oath before the LORD between David and Jonathan son of Saul.