Isaiah 35:3

“Strengthen ye the weak hands, &c.] These are the words of the prophet, as the Targum, “the prophet said, strengthen the weak hands;” or rather of God, by the prophet, to the converted Gentiles, to those who saw the glory of the Lord; particularly to the ministers of the Gospel, who have to do with weak and feeble persons, who can scarcely lift up their hands, or stand upon their legs, under a sense of sin, in a view of wrath, and immediate ruin and destruction, ready to sink and faint, because of their enemies, or through want of food; and their business is to comfort and strengthen them, by preaching the Gospel, and pointing out the promises of it to them: and confirm the feeble knees; that…”

“Strengthen . . . hands . . . confirm . . . knees--The Hebrew for "strengthen" refers to the strength residing in the hand for grasping and holding a thing manfully; "confirm," to the firmness with which one keeps his ground, so as not to be dislodged by any other [MAURER]. Encourage the Jews, now desponding, by the assurance of the blessings promised.”

“Strengthen ye - That is, you who are the religious teachers and guides of the people. This is an address made by the prophet in view of what he had said and was about to say of the proraised blessings. The sense is, strengthen and sustain the feeble and the desponding by the promised blessings; by the assurances Isaiah 34:0 that all the enemies of God and his people will be destroyed; and that he will manifest himself as their Protector, and send upon them the promised blessings. Or it may be regarded as addressed to the officers and ministers of religion when these blessings should have come; and as being an exhortation to them to make use of the influences, the promises, and the…”

“Strengthen - Ye ministers of God, comfort and encourage God's people, who are now ready to faint. Isaiah 35:4”

“35:3 Tired hands and weak knees express discouragement and anxiety (see Heb 12:12).”

“Isa 40:1, Isa 40:2, Isa 52:1, Isa 52:2, Isa 57:14-16; Jdg 7:11; Job 4:3, Job 4:4, Job 16:5; Luk 22:32, Luk 22:43; Act 18:23; Heb 12:12 Isaiah 35:4”

“The prophet now exclaims to the afflicted church, in language of unmixed consolation, that Jehovah is coming. "Strengthen ye the weak hands, and make the trembling knees strong! Say to those of a terrified heart, Be strong! Fear ye not! Behold, your God will come for vengeance, for a divine retribution: He will come, and bring you salvation." Those who have become weak in faith, hopeless and despairing, are to cheer up; and the stronger are to tell such of their brethren as are perplexed and timid, to be comforted now: for Jehovah is coming nâqâm (i.e., as vengeance), and gemūl 'Elōhı̄m (i.e., as retribution, such as God the highly exalted and Almighty Judge inflicts; the expression is…”