Heb. 3:19 KJV (With Strong’s)

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19
So
kai (Greek #2532)
and, also, even, so then, too, etc.; often used in connection (or composition) with other particles or small words
KJV usage: and, also, both, but, even, for, if, or, so, that, then, therefore, when, yet.
Pronounce: kahee
Origin: apparently, a primary particle, having a copulative and sometimes also a cumulative force
i we see
blepo (Greek #991)
to look at (literally or figuratively)
KJV usage: behold, beware, lie, look (on, to), perceive, regard, see, sight, take heed. Compare 3700.
Pronounce: blep'-o
Origin: a primary verb
that
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
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
enter in
eiserchomai (Greek #1525)
to enter (literally or figuratively)
KJV usage: X arise, come (in, into), enter in(-to), go in (through).
Pronounce: ice-er'-khom-ahee
Origin: from 1519 and 2064
because of
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
unbelief
apaistia (Greek #570)
faithlessness, i.e. (negatively) disbelief (lack of Christian faith), or (positively) unfaithfulness (disobedience)
KJV usage: unbelief.
Pronounce: ap-is-tee'-ah
Origin: from 571
.

Cross References

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J. N. Darby Translation

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19
And we see that they could not enter in on account of unbelief;)

W. Kelly Translation

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19
aAnd we see that they could not enter in on account of unbelief.

WK Translation Notes

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a
unbelief: the disobedient means those who did not listen to the word. Hence in 19 it is "unbelief." (Bible Treasury 14:45)