Prov. 30:6 KJV (With Strong’s)

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Add
yacaph (Hebrew #3254)
to add or augment (often adverbial, to continue to do a thing)
KJV usage: add, X again, X any more, X cease, X come more, + conceive again, continue, exceed, X further, X gather together, get more, give more-over, X henceforth, increase (more and more), join, X longer (bring, do, make, much, put), X (the, much, yet) more (and more), proceed (further), prolong, put, be (strong-) er, X yet, yield.
Pronounce: yaw-saf'
Origin: a primitive root
g thou not unto his words
dabar (Hebrew #1697)
a word; by implication, a matter (as spoken of) or thing; adverbially, a cause
KJV usage: act, advice, affair, answer, X any such (thing), because of, book, business, care, case, cause, certain rate, + chronicles, commandment, X commune(-ication), + concern(-ing), + confer, counsel, + dearth, decree, deed, X disease, due, duty, effect, + eloquent, errand, (evil favoured-)ness, + glory, + harm, hurt, + iniquity, + judgment, language, + lying, manner, matter, message, (no) thing, oracle, X ought, X parts, + pertaining, + please, portion, + power, promise, provision, purpose, question, rate, reason, report, request, X (as hast) said, sake, saying, sentence, + sign, + so, some (uncleanness), somewhat to say, + song, speech, X spoken, talk, task, + that, X there done, thing (concerning), thought, + thus, tidings, what(-soever), + wherewith, which, word, work.
Pronounce: daw-baw'
Origin: from 1696
, lest he reprove
yakach (Hebrew #3198)
to be right (i.e. correct); reciprocal, to argue; causatively, to decide, justify or convict
KJV usage: appoint, argue, chasten, convince, correct(-ion), daysman, dispute, judge, maintain, plead, reason (together), rebuke, reprove(-r), surely, in any wise.
Pronounce: yaw-kahh'
Origin: a primitive root
thee, and thou be found a liar
kazab (Hebrew #3576)
to lie (i.e. deceive), literally or figuratively
KJV usage: fail, (be found a, make a) liar, lie, lying, be in vain.
Pronounce: kaw-zab'
Origin: a primitive root
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Cross References

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J. N. Darby Translation

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Add thou not unto his words, lest he reprove thee, and thou be found a liar.