1 Samuel 20:17

And again Jonathan sware unto David, by his love to him, - for, as he loved his own soul, so loved he him.

1 Samuel 18:1

And it came to pass, when he had made an end of speaking unto Saul, that, the soul of Jonathan, was knit with, the soul of David, so that Jonathan loved him, as his own soul.

1 Samuel 18:3

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

Deuteronomy 13:6

When thy brother - son of thine own mother or thine own son or thine own daughter, or the wife of thy bosom, or thy friend who is as thine own soul, shall entice thee secretly, saying, - Let us go and serve other gods, whom thou hast not known, thou, nor thy fathers;

2 Samuel 1:26

I am distressed for thee, my brother, Jonathan! Delightful to me, exceedingly, - Wonderful, was thy love to me, passing the love of women.

Proverbs 18:24

A man having many friends, shall come to ruin, but there is a loving one, who sticketh closer than a brother.

Treasury of Scripture Knowledge

Summary

And Jonathan caused David to swear again, because he loved him: for he loved him as he loved his own soul.

General references

Bible References

Because he loved him

1 Samuel 18:1
And it came to pass, when he had made an end of speaking unto Saul, that, the soul of Jonathan, was knit with, the soul of David, so that Jonathan loved him, as his own soul.
Deuteronomy 13:6
When thy brother - son of thine own mother or thine own son or thine own daughter, or the wife of thy bosom, or thy friend who is as thine own soul, shall entice thee secretly, saying, - Let us go and serve other gods, whom thou hast not known, thou, nor thy fathers;
2 Samuel 1:26
I am distressed for thee, my brother, Jonathan! Delightful to me, exceedingly, - Wonderful, was thy love to me, passing the love of women.
Proverbs 18:24
A man having many friends, shall come to ruin, but there is a loving one, who sticketh closer than a brother.

General references

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.