1 Samuel 18:3
Then Jonathan made a covenant with David, because he loved him as his [own] soul.
1 Samuel 20:8-17
So you must show loyal love to your servant, for you have brought your servant into a covenant of Yahweh with you. But if there [is] guilt in me, [then] kill me yourself! But why should you bring me to your father?"
1 Samuel 20:42
Jonathan said to David, "Go in peace, because we have sworn, the two of us, [an oath] in the name of Yahweh, saying, "Yahweh will be between me and you, and between my offspring and your offspring forever." Then he got up and left, and Jonathan went into the city.
1 Samuel 23:18
Then the two of them {made} a covenant before Yahweh. David remained at Horesh, and Jonathan went to his house.
2 Samuel 9:1-3
Then David said, "[Is] there still anyone who [is] left for the house of Saul that I may show loyal love to him for the sake of Jonathan?"
2 Samuel 21:7
But the king spared Mephibosheth the son of Jonathan, the son of Saul, because of the sworn oath of Yahweh which [was] between them, between David and Jonathan the son of Saul.