1 Samuel 20:17

Once again Jonathan made David promise to love him. Jonathan loved David as much as he loved himself.

1 Samuel 18:1

David finished talking to Saul. Jonathan became David's closest friend. He loved David as much as he loved himself.

1 Samuel 18:3

Jonathan made a covenant with David. He loved him as himself.

Deuteronomy 13:6

If your brother, your mother's son, or your son or daughter, or the wife you cherish, or your very best friend tries to secretly entice you, saying: 'Let us go and serve other gods, gods neither you nor your fathers have known,

2 Samuel 1:26

I grieve for you, my brother Jonathan. You were dear to me! How wonderful was your love for me. It was better than the love of women.

Proverbs 18:24

A man with friends must be friendly! A friend sticks 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
David finished talking to Saul. Jonathan became David's closest friend. He loved David as much as he loved himself.
Deuteronomy 13:6
If your brother, your mother's son, or your son or daughter, or the wife you cherish, or your very best friend tries to secretly entice you, saying: 'Let us go and serve other gods, gods neither you nor your fathers have known,
2 Samuel 1:26
I grieve for you, my brother Jonathan. You were dear to me! How wonderful was your love for me. It was better than the love of women.
Proverbs 18:24
A man with friends must be friendly! A friend sticks closer than a brother.

General references

1 Samuel 23:18
They both promised Jehovah that they would always be loyal to each other. Then Jonathan went home while David stayed at Horesh.
Proverbs 17:17
A friend loves at all times. A true brother is born for adversity.