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 ye comfortably to Jerusalem, and cry unto her, that her warfare is accomplished, that her iniquity is pardoned: for she hath received of the Lord'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, O Jerusalem, the holy city: for henceforth there shall no more come into thee the uncircumcised and the unclean.
2Shake thyself from the dust; arise, and sit down, O Jerusalem: loose thyself from the bands of thy neck, O captive daughter of Zion.
(Isa. 52:1‑2)
;
Isa. 57:14‑16• 14And shall say, Cast ye up, cast ye up, prepare the way, take up the stumblingblock out of the way of my people.
15For thus saith the high and lofty One that inhabiteth eternity, whose name is Holy; I dwell in the high and holy place, with him also 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 should 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 afterward shall thine hands be strengthened to go down unto the host. Then went he down with Phurah his servant unto the outside of the armed men that were in the host. (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 falling, and thou hast strengthened the feeble knees.
(Job 4:3‑4)
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Job 16:5• 5But I would strengthen you with my mouth, and the moving of my lips should asswage your grief. (Job 16:5)
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Luke 22:32,43• 32But I have prayed for thee, that thy faith fail not: and when thou art converted, strengthen thy brethren.
43And there appeared an angel unto him from heaven, strengthening him.
(Luke 22:32,43)
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Acts 18:23• 23And after he had spent some time there, he departed, and went over all the country of Galatia and Phrygia in order, strengthening all the disciples. (Acts 18:23)
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Heb. 12:12• 12Wherefore lift up the hands which hang down, and the feeble knees; (Heb. 12:12)

J. N. Darby Translation

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Strengthen the weak hands and confirm the tottering knees.