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Jonathan caused David to swear again, because he loved him: for he loved him as he loved his own soul. 20:17
Trivia: What was the name of the Philistine god who fell on his face (twice) in front of the ark of God in Ashdod?
"The soul of Jonathan was knit with the soul of David, and Jonathan loved him as his own soul ... And Jonathan stripped himself of the robe that was upon him, and gave it to David, and his garments ... and his girdle." 18:1-4
"Jonathan ... delighted much in David." 19:2
David and Jonathan "kissed one another, and wept with one another" when they parted for the last time. 20:41