1 Samuel 18:1

After David had finished speaking with Saul, the souls of Jonathan and David were knit together, and Jonathan loved him as himself.
BSB · Berean Standard Bible
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.
KJV · King James Version
When he had finished speaking to Saul, the soul of Jonathan was knit with the soul of David, and Jonathan loved him as his own soul.
WEB · World English Bible
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.
ASV · American Standard Version

Related passages

From the Treasury of Scripture Knowledge, grouped by the word they explain.

the soul of Jonathan
The modesty, piety, and courage of David were so congenial to the character of the amiable Jonathan, that they attracted his most cordial esteem and affection; so that the most intimate friendship subsisted between them from that time, and they loved each other with pure hearts fervently. Their friendship could not be affected by the common vicissitudes of life; and it exemplifies by fact what the ancients have written on the subject; [Ten philian isoteta einai, kai mian psychen ton philon heteron auton.] "Friendship is an entire sameness, and one soul: a friend is another self."
1 Samuel 14:1–14, 45; Genesis 44:30; Judges 20:11; 1 Chronicles 12:17; Psalm 86:11; Colossians 2:2
loved him
1 Samuel 18:3; 1 Samuel 19:2; 1 Samuel 20:17; Deuteronomy 13:6; 2 Samuel 1:26; Proverbs 18:24