John 12:39 KJV (With Strong’s)

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39
Therefore
dia (Greek #1223)
through (in very wide applications, local, causal, or occasional)
KJV usage: after, always, among, at, to avoid, because of (that), briefly, by, for (cause) ... fore, from, in, by occasion of, of, by reason of, for sake, that, thereby, therefore, X though, through(-out), to, wherefore, with (-in). In composition it retains the same general importance.
Pronounce: dee-ah'
Origin: a primary preposition denoting the channel of an act
they could
dunamai (Greek #1410)
to be able or possible
KJV usage: be able, can (do, + -not), could, may, might, be possible, be of power.
Pronounce: doo'-nam-ahee
Origin: of uncertain affinity
not
ou (Greek #3756)
the absolute negative (compare 3361) adverb; no or not
KJV usage: + long, nay, neither, never, no (X man), none, (can-)not, + nothing, + special, un(-worthy), when, + without, + yet but. See also 3364, 3372.
Pronounce: oo
Origin: οὐκ (ook), and (before an aspirate) οὐχ (ookh) a primary word
believe
pisteuo (Greek #4100)
to have faith (in, upon, or with respect to, a person or thing), i.e. credit; by implication, to entrust (especially one's spiritual well-being to Christ)
KJV usage: believe(-r), commit (to trust), put in trust with.
Pronounce: pist-yoo'-o
Origin: from 4102
, because
hoti (Greek #3754)
demonstrative, that (sometimes redundant); causative, because
KJV usage: as concerning that, as though, because (that), for (that), how (that), (in) that, though, why.
Pronounce: hot'-ee
Origin: neuter of 3748 as conjunction
that
touto (Greek #5124)
that thing
KJV usage: here (-unto), it, partly, self(-same), so, that (intent), the same, there(-fore, -unto), this, thus, where(-fore).
Pronounce: too'-to
Origin: neuter singular nominative or accusative case of 3778
Esaias
Hesaias (Greek #2268)
Hesaias (i.e. Jeshajah), an Israelite
KJV usage: Esaias.
Pronounce: hay-sah-ee'-as
Origin: of Hebrew origin (03470)
said
epo (Greek #2036)
to speak or say (by word or writing)
KJV usage: answer, bid, bring word, call, command, grant, say (on), speak, tell. Compare 3004.
Pronounce: ep'-o
Origin: a primary verb (used only in the definite past tense, the others being borrowed from 2046, 4483, and 5346)
q again
palin (Greek #3825)
(adverbially) anew, i.e. (of place) back, (of time) once more, or (conjunctionally) furthermore or on the other hand
KJV usage: again.
Pronounce: pal'-in
Origin: probably from the same as 3823 (through the idea of oscillatory repetition)
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Cross References

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they.
because.

J. N. Darby Translation

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39
On this account they could not believe, because Esaias said againd,

JND Translation Notes

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d
See Isa. 6.9-10.

W. Kelly Translation

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39
On this account they could not believe because Isaiah said again,