1 Samuel 18:1

As soon as he had finished speaking to Saul , the soul of Jonathan was knit to the soul of David , and Jonathan loved him as his own soul .

After David had finished talking with Saul, Jonathan became one in spirit with David, and he loved him as himself.

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, and Jonathan loved him as his own soul.