King James Version
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.English Standard Version
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.New International Version
After David had finished talking with Saul, Jonathan became one in spirit with David, and he loved him as himself.