Gen. 18:21 KJV (With Strong’s)

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21
I will go down
yarad (Hebrew #3381)
a primitive root; to descend (literally, to go downwards; or conventionally to a lower region, as the shore, a boundary, the enemy, etc.; or figuratively, to fall); causatively, to bring down (in all the above applications): --X abundantly, bring down, carry down, cast down, (cause to) come(-ing) down, fall (down), get down, go(-ing) down(-ward), hang down, X indeed, let down, light (down), put down (off), (cause to, let) run down, sink, subdue, take down.
Pronounce: yaw-rad'
m now, and see
ra'ah (Hebrew #7200)
to see, literally or figuratively (in numerous applications, direct and implied, transitive, intransitive and causative)
KJV usage: advise self, appear, approve, behold, X certainly, consider, discern, (make to) enjoy, have experience, gaze, take heed, X indeed, X joyfully, lo, look (on, one another, one on another, one upon another, out, up, upon), mark, meet, X be near, perceive, present, provide, regard, (have) respect, (fore-, cause to, let) see(-r, -m, one another), shew (self), X sight of others, (e-)spy, stare, X surely, X think, view, visions.
Pronounce: raw-aw'
Origin: a primitive root
whether they have done
`asah (Hebrew #6213)
to do or make, in the broadest sense and widest application (as follows)
KJV usage: accomplish, advance, appoint, apt, be at, become, bear, bestow, bring forth, bruise, be busy, X certainly, have the charge of, commit, deal (with), deck, + displease, do, (ready) dress(-ed), (put in) execute(-ion), exercise, fashion, + feast, (fight-)ing man, + finish, fit, fly, follow, fulfill, furnish, gather, get, go about, govern, grant, great, + hinder, hold ((a feast)), X indeed, + be industrious, + journey, keep, labour, maintain, make, be meet, observe, be occupied, offer, + officer, pare, bring (come) to pass, perform, pracise, prepare, procure, provide, put, requite, X sacrifice, serve, set, shew, X sin, spend, X surely, take, X thoroughly, trim, X very, + vex, be (warr-)ior, work(-man), yield, use.
Pronounce: aw-saw'
Origin: a primitive root
altogether
kalah (Hebrew #3617)
a completion; adverb, completely; also destruction
KJV usage: altogether, (be, utterly) consume(-d), consummation(-ption), was determined, (full, utter) end, riddance.
Pronounce: kaw-law'
Origin: from 3615
according to the cry
tsa`aqah (Hebrew #6818)
a shriek
KJV usage: cry(-ing).
Pronounce: tsah-ak-aw'
Origin: from 6817
of it, which is come
bow' (Hebrew #935)
to go or come (in a wide variety of applications)
KJV usage: abide, apply, attain, X be, befall, + besiege, bring (forth, in, into, to pass), call, carry, X certainly, (cause, let, thing for) to come (against, in, out, upon, to pass), depart, X doubtless again, + eat, + employ, (cause to) enter (in, into, -tering, -trance, -try), be fallen, fetch, + follow, get, give, go (down, in, to war), grant, + have, X indeed, (in-)vade, lead, lift (up), mention, pull in, put, resort, run (down), send, set, X (well) stricken (in age), X surely, take (in), way.
Pronounce: bo
Origin: a primitive root
unto me; and if notn, I will know
yada` (Hebrew #3045)
to know (properly, to ascertain by seeing); used in a great variety of senses, figuratively, literally, euphemistically and inferentially (including observation, care, recognition; and causatively, instruction, designation, punishment, etc.) (as follow)
KJV usage: acknowledge, acquaintance(-ted with), advise, answer, appoint, assuredly, be aware, (un-)awares, can(-not), certainly, comprehend, consider, X could they, cunning, declare, be diligent, (can, cause to) discern, discover, endued with, familiar friend, famous, feel, can have, be (ig-)norant, instruct, kinsfolk, kinsman, (cause to let, make) know, (come to give, have, take) knowledge, have (knowledge), (be, make, make to be, make self) known, + be learned, + lie by man, mark, perceive, privy to, X prognosticator, regard, have respect, skilful, shew, can (man of) skill, be sure, of a surety, teach, (can) tell, understand, have (understanding), X will be, wist, wit, wot.
Pronounce: yaw-dah'
Origin: a primitive root
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Cross References

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I will go down.This is spoken figuratively; and as the Jewish writers speak, according to the language of men.
So eyes, ears, hands, and other members of the body are attributed to God, for effecting those things which men cannot accomplish without these members.
see.
I will know.
Ex. 33:5• 5For the Lord had said unto Moses, Say unto the children of Israel, Ye are a stiffnecked people: I will come up into the midst of thee in a moment, and consume thee: therefore now put off thy ornaments from thee, that I may know what to do unto thee. (Ex. 33:5)
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Deut. 8:2• 2And thou shalt remember all the way which the Lord thy God led thee these forty years in the wilderness, to humble thee, and to prove thee, to know what was in thine heart, whether thou wouldest keep his commandments, or no. (Deut. 8:2)
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Deut. 13:3• 3Thou shalt not hearken unto the words of that prophet, or that dreamer of dreams: for the Lord your God proveth you, to know whether ye love the Lord your God with all your heart and with all your soul. (Deut. 13:3)
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Josh. 22:22• 22The Lord God of gods, the Lord God of gods, he knoweth, and Israel he shall know; if it be in rebellion, or if in transgression against the Lord, (save us not this day,) (Josh. 22:22)
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Psa. 139:1‑24• 1<<To the chief Musician, A Psalm of David.>> O Lord, thou hast searched me, and known me.
2Thou knowest my downsitting and mine uprising, thou understandest my thought afar off.
3Thou compassest my path and my lying down, and art acquainted with all my ways.
4For there is not a word in my tongue, but, lo, O Lord, thou knowest it altogether.
5Thou hast beset me behind and before, and laid thine hand upon me.
6Such knowledge is too wonderful for me; it is high, I cannot attain unto it.
7Whither shall I go from thy spirit? or whither shall I flee from thy presence?
8If I ascend up into heaven, thou art there: if I make my bed in hell, behold, thou art there.
9If I take the wings of the morning, and dwell in the uttermost parts of the sea;
10Even there shall thy hand lead me, and thy right hand shall hold me.
11If I say, Surely the darkness shall cover me; even the night shall be light about me.
12Yea, the darkness hideth not from thee; but the night shineth as the day: the darkness and the light are both alike to thee.
13For thou hast possessed my reins: thou hast covered me in my mother's womb.
14I will praise thee; for I am fearfully and wonderfully made: marvellous are thy works; and that my soul knoweth right well.
15My substance was not hid from thee, when I was made in secret, and curiously wrought in the lowest parts of the earth.
16Thine eyes did see my substance, yet being unperfect; and in thy book all my members were written, which in continuance were fashioned, when as yet there was none of them.
17How precious also are thy thoughts unto me, O God! how great is the sum of them!
18If I should count them, they are more in number than the sand: when I awake, I am still with thee.
19Surely thou wilt slay the wicked, O God: depart from me therefore, ye bloody men.
20For they speak against thee wickedly, and thine enemies take thy name in vain.
21Do not I hate them, O Lord, that hate thee? and am not I grieved with those that rise up against thee?
22I hate them with perfect hatred: I count them mine enemies.
23Search me, O God, and know my heart: try me, and know my thoughts:
24And see if there be any wicked way in me, and lead me in the way everlasting.
(Psa. 139:1‑24)
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Luke 16:15• 15And he said unto them, Ye are they which justify yourselves before men; but God knoweth your hearts: for that which is highly esteemed among men is abomination in the sight of God. (Luke 16:15)
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2 Cor. 11:11• 11Wherefore? because I love you not? God knoweth. (2 Cor. 11:11)

J. N. Darby Translation

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21
I will go down now, and see whether they have done altogether according to the cry of it, which is come to me; and if not, I will know it.