Acts 12:16 KJV (With Strong’s)

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16
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ho (Greek #3588)
the definite article; the (sometimes to be supplied, at others omitted, in English idiom)
KJV usage: the, this, that, one, he, she, it, etc.
Pronounce: ho
Origin: ἡ (hay), and the neuter τό (to) in all their inflections
But
de (Greek #1161)
but, and, etc.
KJV usage: also, and, but, moreover, now (often unexpressed in English).
Pronounce: deh
Origin: a primary particle (adversative or continuative)
Peter
Petros (Greek #4074)
a (piece of) rock (larger than 3037); as a name, Petrus, an apostle
KJV usage: Peter, rock. Compare 2786.
Pronounce: pet'-ros
Origin: apparently a primary word
continued
epimeno (Greek #1961)
to stay over, i.e. remain (figuratively, persevere)
KJV usage: abide (in), continue (in), tarry.
Pronounce: ep-ee-men'-o
Origin: from 1909 and 3306
knocking
krouo (Greek #2925)
to rap
KJV usage: knock.
Pronounce: kroo'-o
Origin: apparently a primary verb
: and
de (Greek #1161)
but, and, etc.
KJV usage: also, and, but, moreover, now (often unexpressed in English).
Pronounce: deh
Origin: a primary particle (adversative or continuative)
when they had opened
anoigo (Greek #455)
to open up (literally or figuratively, in various applications)
KJV usage: open.
Pronounce: an-oy'-go
Origin: from 303 and οἴγω (to open)
the door, and saw
eido (Greek #1492)
used only in certain past tenses, the others being borrowed from the equivalent 3700 and 3708; properly, to see (literally or figuratively); by implication, (in the perfect tense only) to know
KJV usage: be aware, behold, X can (+ not tell), consider, (have) know(-ledge), look (on), perceive, see, be sure, tell, understand, wish, wot. Compare 3700.
Pronounce: i'-do
Origin: a primary verb
him
autos (Greek #846)
the reflexive pronoun self, used (alone or in the comparative 1438) of the third person , and (with the proper personal pronoun) of the other persons
KJV usage: her, it(-self), one, the other, (mine) own, said, (self-), the) same, ((him-, my-, thy- )self, (your-)selves, she, that, their(-s), them(-selves), there(-at, - by, -in, -into, -of, -on, -with), they, (these) things, this (man), those, together, very, which. Compare 848.
Pronounce: ow-tos'
Origin: from the particle αὖ (perhaps akin to the base of 109 through the idea of a baffling wind) (backward)
, *
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
they were astonished
existemi (Greek #1839)
to put (stand) out of wits, i.e. astound, or (reflexively) become astounded, insane
KJV usage: amaze, be (make) astonished, be beside self (selves), bewitch, wonder.
Pronounce: ex-is'-tay-mee
Origin: from 1537 and 2476
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Cross References

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Ministry on This Verse

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 The poor saints, although praying fervently (they had prayer meetings in those days), can hardly believe, when Peter comes to the door, that God had really granted their prayer. The desire presents itself sincerely to God; faith can scarcely reckon upon Him. (Acts 12 by J.N. Darby)

J. N. Darby Translation

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16
But Peter continued knocking: and having opened, they saw him and were astonished.

W. Kelly Translation

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16
But Peter continued knocking, and on opening they saw him and were amazed.