1 Samuel 18:3

And Jonathan and David solemnised a covenant, - because he loved him as his own soul.

1 Samuel 20:8-17

Thus shalt thou do a lovingkindness for thy servant, for, into a covenant of Yahweh, hast thou brought thy servant, with thee, - But, if there is in me transgression, put me to death, thyself, for, unto thy father, wherefore shouldst thou bring me in?

1 Samuel 20:42

Then said Jonathan unto David - Go in peace, - remembering that, we, have both sworn in the name of Yahweh, saying, Yahweh shall be between me and thee, and between my seed and thy seed, unto times age-abiding. And he arose, and departed, - and, Jonathan, entered the city.

1 Samuel 23:18

And they two solemnised a covenant before Yahweh, - and David remained in the thicket, but, Jonathan, departed to his own house.

2 Samuel 9:1-3

And David said, Is there yet one left unto the house of Saul, - that I may show him lovingkindness, for the sake of, Jonathan?

2 Samuel 21:7

But the king had pity upon Mephibosheth, son of Jonathan, Saul's son, - because of the oath of Yahweh that was between them, between David and Jonathan, Saul's son.

Treasury of Scripture Knowledge

Summary

Then Jonathan and David made a covenant, because he loved him as his own soul.

Bible References

General references

Genesis 21:32
And when they had solemnised a covenant in Beer-sheba, - then arose Abimelech, with Phicol chief of his host, and returned unto the land of the Philistines.
1 Samuel 23:18
And they two solemnised a covenant before Yahweh, - and David remained in the thicket, but, Jonathan, departed to his own house.
Proverbs 17:17
At all times, doth a friend love, and, a brother for distress, must be born.