1 Samuel 18

"After David had finished talking with Saul, he met Jonathan, the king’s son. There was an immediate bond of love between them, and they became the best of friends." v.1
When David and Jonathan met, they became close friends at once. Their friendship is one of the deepest and closest recorded in the Bible. Here is why:

1.) They based their friendship on a commitment to God, not just each other.
2.) They let nothing come between them, not a career or even family problems.
3.) They grew closer together when their friendship was tested.
4.) They remained friends to the end.

Jonathan, the prince of Israel, later realized that David, and not he, would be the next King. But that didn't weaken his love for David. Jonathan would much rather lose the throne of Israel than lose his closest friend.

Taken from the NLT Life Application Study Bible