1 Sam. 18:3 KJV (With Strong’s)

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3
Then Jonathan
Yhownathan (Hebrew #3083)
Jehovah-given; Jehonathan, the name of four Israelites
KJV usage: Jonathan. Compare 3129.
Pronounce: yeh-ho-naw-thawn'
Origin: from 3068 and 5414
and David
David (Hebrew #1732)
Daviyd {daw-veed'}; from the same as 1730; loving; David, the youngest son of Jesse
KJV usage: David.
Pronounce: daw-veed'
Origin: rarely (fully)
made
karath (Hebrew #3772)
to cut (off, down or asunder); by implication, to destroy or consume; specifically, to covenant (i.e. make an alliance or bargain, originally by cutting flesh and passing between the pieces)
KJV usage: be chewed, be con-(feder-)ate, covenant, cut (down, off), destroy, fail, feller, be freed, hew (down), make a league ((covenant)), X lose, perish, X utterly, X want.
Pronounce: kaw-rath'
Origin: a primitive root
a covenant
briyth (Hebrew #1285)
a compact (because made by passing between pieces of flesh)
KJV usage: confederacy, (con-)feder(-ate), covenant, league.
Pronounce: ber-eeth'
Origin: from 1262 (in the sense of cutting (like 1254))
, because he loved
'ahabah (Hebrew #160)
feminine of 158 and meaning the same
KJV usage: love.
Pronounce: a-hab-aw
him as his own soul
nephesh (Hebrew #5315)
properly, a breathing creature, i.e. animal of (abstractly) vitality; used very widely in a literal, accommodated or figurative sense (bodily or mental)
KJV usage: any, appetite, beast, body, breath, creature, X dead(-ly), desire, X (dis-)contented, X fish, ghost, + greedy, he, heart(-y), (hath, X jeopardy of) life (X in jeopardy), lust, man, me, mind, mortally, one, own, person, pleasure, (her-, him-, my-, thy-)self, them (your)-selves, + slay, soul, + tablet, they, thing, (X she) will, X would have it.
Pronounce: neh'-fesh
Origin: from 5314
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Cross References

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made a covenant.
1 Sam. 20:8‑17,42• 8Therefore thou shalt deal kindly with thy servant; for thou hast brought thy servant into a covenant of the Lord with thee: notwithstanding, if there be in me iniquity, slay me thyself; for why shouldest thou bring me to thy father?
9And Jonathan said, Far be it from thee: for if I knew certainly that evil were determined by my father to come upon thee, then would not I tell it thee?
10Then said David to Jonathan, Who shall tell me? or what if thy father answer thee roughly?
11And Jonathan said unto David, Come, and let us go out into the field. And they went out both of them into the field.
12And Jonathan said unto David, O Lord God of Israel, when I have sounded my father about to morrow any time, or the third day, and, behold, if there be good toward David, and I then send not unto thee, and show it thee;
13The Lord do so and much more to Jonathan: but if it please my father to do thee evil, then I will show it thee, and send thee away, that thou mayest go in peace: and the Lord be with thee, as he hath been with my father.
14And thou shalt not only while yet I live show me the kindness of the Lord, that I die not:
15But also thou shalt not cut off thy kindness from my house for ever: no, not when the Lord hath cut off the enemies of David every one from the face of the earth.
16So Jonathan made a covenant with the house of David, saying, Let the Lord even require it at the hand of David's enemies.
17And Jonathan caused David to swear again, because he loved him: for he loved him as he loved his own soul.
42And Jonathan said to David, Go in peace, forasmuch as we have sworn both of us in the name of the Lord, saying, The Lord be between me and thee, and between my seed and thy seed for ever. And he arose and departed: and Jonathan went into the city.
(1 Sam. 20:8‑17,42)
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1 Sam. 23:18• 18And they two made a covenant before the Lord: and David abode in the wood, and Jonathan went to his house. (1 Sam. 23:18)
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2 Sam. 9:1‑3• 1And David said, Is there yet any that is left of the house of Saul, that I may show him kindness for Jonathan's sake?
2And there was of the house of Saul a servant whose name was Ziba. And when they had called him unto David, the king said unto him, Art thou Ziba? And he said, Thy servant is he.
3And the king said, Is there not yet any of the house of Saul, that I may show the kindness of God unto him? And Ziba said unto the king, Jonathan hath yet a son, which is lame on his feet.
(2 Sam. 9:1‑3)
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2 Sam. 21:7• 7But the king spared Mephibosheth, the son of Jonathan the son of Saul, because of the Lord's oath that was between them, between David and Jonathan the son of Saul. (2 Sam. 21:7)

J. N. Darby Translation

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And Jonathan and David made a covenant, because he loved him as his own soul.