1 Sam. 24:21 KJV (With Strong’s)

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21
Swear
shaba` (Hebrew #7650)
propr. to be complete, but used only as a denominative from 7651; to seven oneself, i.e. swear (as if by repeating a declaration seven times)
KJV usage: adjure, charge (by an oath, with an oath), feed to the full (by mistake for 7646), take an oath, X straitly, (cause to, make to) swear.
Pronounce: shaw-bah'
Origin: a primitive root
now therefore unto me by the Lord
Yhovah (Hebrew #3068)
(the) self-Existent or Eternal; Jehovah, Jewish national name of God
KJV usage: Jehovah, the Lord. Compare 3050, 3069.
Pronounce: yeh-ho-vaw'
Origin: from 1961
, that thou wilt not
'im (Hebrew #518)
used very widely as demonstrative, lo!; interrog., whether?; or conditional, if, although; also Oh that!, when; hence, as a negative, not
KJV usage: (and, can-, doubtless, if, that) (not), + but, either, + except, + more(-over if, than), neither, nevertheless, nor, oh that, or, + save (only, -ing), seeing, since, sith, + surely (no more, none, not), though, + of a truth, + unless, + verily, when, whereas, whether, while, + yet.
Pronounce: eem
Origin: a primitive particle
cut off
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
my seed
zera` (Hebrew #2233)
seed; figuratively, fruit, plant, sowing-time, posterity
KJV usage: X carnally, child, fruitful, seed(-time), sowing- time.
Pronounce: zeh'-rah
Origin: from 2232
after
'achar (Hebrew #310)
properly, the hind part; generally used as an adverb or conjunction, after (in various senses)
KJV usage: after (that, -ward), again, at, away from, back (from, -side), behind, beside, by, follow (after, -ing), forasmuch, from, hereafter, hinder end, + out (over) live, + persecute, posterity, pursuing, remnant, seeing, since, thence(-forth), when, with.
Pronounce: akh-ar'
Origin: from 309
me, and thatn thou wilt not destroy
shamad (Hebrew #8045)
to desolate
KJV usage: destory(- uction), bring to nought, overthrow, perish, pluck down, X utterly.
Pronounce: shaw-mad'
Origin: a primitive root
my name
shem (Hebrew #8034)
an appellation, as a mark or memorial of individuality; by implication honor, authority, character
KJV usage: + base, (in-)fame(-ous), named(-d), renown, report.
Pronounce: shame
Origin: a primitive word (perhaps rather from 7760 through the idea of definite and conspicuous position; compare 8064)
out of my father’s
'ab (Hebrew #1)
father, in a literal and immediate, or figurative and remote application)
KJV usage: chief, (fore-)father(-less), X patrimony, principal. Compare names in "Abi-".
Pronounce: awb
Origin: a primitive word
house
bayith (Hebrew #1004)
a house (in the greatest variation of applications, especially family, etc.)
KJV usage: court, daughter, door, + dungeon, family, + forth of, X great as would contain, hangings, home(born), (winter)house(-hold), inside(-ward), palace, place, + prison, + steward, + tablet, temple, web, + within(-out).
Pronounce: bah'-yith
Origin: probably from 1129 abbreviated
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Cross References

+
Swear.
that thou.

J. N. Darby Translation

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21
Swear now therefore to me by Jehovah, that thou wilt not cut off my seed after me, and that thou wilt not destroy my name out of my father’s house.