Isa. 35:3 KJV (With Strong’s)

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3
Strengthen
chazaq (Hebrew #2388)
to fasten upon; hence, to seize, be strong (figuratively, courageous, causatively strengthen, cure, help, repair, fortify), obstinate; to bind, restrain, conquer
KJV usage: aid, amend, X calker, catch, cleave, confirm, be constant, constrain, continue, be of good (take) courage(-ous, -ly), encourage (self), be established, fasten, force, fortify, make hard, harden, help, (lay) hold (fast), lean, maintain, play the man, mend, become (wax) mighty, prevail, be recovered, repair, retain, seize, be (wax) sore, strengthen (self), be stout, be (make, shew, wax) strong(-er), be sure, take (hold), be urgent, behave self valiantly, withstand.
Pronounce: khaw-zak'
Origin: a primitive root
i ye the weak
rapheh (Hebrew #7504)
slack (in body or mind)
KJV usage: weak. raphah, Raphah. See 7497, 7498. riphah. See 7383.
Pronounce: raw-feh'
Origin: from 7503
hands
yad (Hebrew #3027)
a hand (the open one (indicating power, means, direction, etc.), in distinction from 3709, the closed one); used (as noun, adverb, etc.) in a great variety of applications, both literally and figuratively, both proximate and remote (as follows)
KJV usage: (+ be) able, X about, + armholes, at, axletree, because of, beside, border, X bounty, + broad, (broken-)handed, X by, charge, coast, + consecrate, + creditor, custody, debt, dominion, X enough, + fellowship, force, X from, hand(-staves, -y work), X he, himself, X in, labour, + large, ledge, (left-)handed, means, X mine, ministry, near, X of, X order, ordinance, X our, parts, pain, power, X presumptuously, service, side, sore, state, stay, draw with strength, stroke, + swear, terror, X thee, X by them, X themselves, X thine own, X thou, through, X throwing, + thumb, times, X to, X under, X us, X wait on, (way-)side, where, + wide, X with (him, me, you), work, + yield, X yourselves.
Pronounce: yawd
Origin: a primitive word
, and confirm
'amats (Hebrew #553)
to be alert, physically (on foot) or mentally (in courage)
KJV usage: confirm, be courageous (of good courage, stedfastly minded, strong, stronger), establish, fortify, harden, increase, prevail, strengthen (self), make strong (obstinate, speed).
Pronounce: aw-mats'
Origin: a primitive root
the feeble
kashal (Hebrew #3782)
to totter or waver (through weakness of the legs, especially the ankle); by implication, to falter, stumble, faint or fall
KJV usage: bereave (from the margin), cast down, be decayed, (cause to) fail, (cause, make to) fall (down, -ing), feeble, be (the) ruin(-ed, of), (be) overthrown, (cause to) stumble, X utterly, be weak.
Pronounce: kaw-shal'
Origin: a primitive root
knees
berek (Hebrew #1290)
a knee
KJV usage: knee.
Pronounce: beh'-rek
Origin: from 1288
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Cross References

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Isa. 40:1‑2• 1Comfort ye, comfort ye my people, saith your God.
2Speak to the heart of Jerusalem, and cry unto her, that her time of suffering is accomplished, that her iniquity is pardoned; for she hath received of Jehovah's hand double for all her sins.
(Isa. 40:1‑2)
;
Isa. 52:1‑2• 1Awake, awake; put on thy strength, O Zion; put on thy beautiful garments, Jerusalem, the holy city: for henceforth there shall no more come into thee the uncircumcised and the unclean.
2Shake thyself from the dust; arise, sit down, Jerusalem: loose thyself from the bands of thy neck, captive daughter of Zion.
(Isa. 52:1‑2)
;
Isa. 57:14‑16• 14And it shall be said, Cast up, cast up, prepare the way, take up the stumbling-blocks out of the way of my people.
15For thus saith the high and lofty One that inhabiteth eternity, and whose name is Holy: I dwell in the high and holy place, and with him that is of a contrite and humble spirit, to revive the spirit of the humble, and to revive the heart of the contrite ones.
16For I will not contend for ever, neither will I be always wroth; for the spirit would fail before me, and the souls which I have made.
(Isa. 57:14‑16)
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Judg. 7:11• 11and thou shalt hear what they say; and afterwards shall thy hand be strengthened, and thou shalt go down unto the camp. And he went down with Phurah his servant to the outside of the armed men that were in the camp. (Judg. 7:11)
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Job 4:3‑4• 3Behold, thou hast instructed many, and thou hast strengthened the weak hands;
4Thy words have upholden him that was stumbling, and thou hast braced up the bending knees:
(Job 4:3‑4)
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Job 16:5• 5But I would encourage you with my mouth, and the solace of my lips should assuage your pain. (Job 16:5)
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Luke 22:32,43• 32but *I* have besought for thee that thy faith fail not; and *thou*, when once thou hast been restored, confirm thy brethren.
43And an angel appeared to him from heaven strengthening him.
(Luke 22:32,43)
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Acts 18:23• 23And having stayed there some time, he went forth, passing in order through the country of Galatia and Phrygia, establishing all the disciples. (Acts 18:23)
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Heb. 12:12• 12Wherefore lift up the hands that hang down, and the failing knees; (Heb. 12:12)

J. N. Darby Translation

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Strengthen the weak hands and confirm the tottering knees.