Strengthen ye the weak hands. We might explain this passage generally, as if he had said, "Let those who have feeble hands strengthen them, let; them whose knees tremble and totter compose and invigorate their hearts." But the following verse shews that the whole of this passage relates to the ministers of the word; for he addresses the teachers of the Church, and enjoins them to exhort, arouse, and encourage weak men whose hearts are broken or cast down, that they may be rendered more firm and cheerful. This exhortation is seasonably introduced, because he saw that so many tokens of God's anger, of which he had spoken, could not do otherwise than fill even the strongest minds with alarm and dread; for, seeing that we are always enfeebled by adversity, when God himself proclaims what may be called open war against us on account of our sins, who would not tremble? But the Prophet commands that they who are cast down and almost lifeless shall be enlivened, and the manner of doing it is explained by him in the following verse.

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 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 consolations which would attend the coming of the Messiah, to strengthen the feeble, and confirm those who were faint-hearted.
The weak hands, and confirm the feeble knees - Strength resides mainly in the arms, and in the lower limbs, or the knees. If these are feeble, the whole frame is feeble. Fear relaxes the strength of the arms, and the firmness of the knees; and the expressions 'weak hands,' and 'feeble knees,' become synonymous with saying, of a timid, fearful, and desponding frame of mind. Such were to be strengthened by the assurance of the favor of God, and by the consolations which would flow from the reign of the Messiah. The Jews, who looked abroad upon the desolations of their country, were to be comforted by the hope of future blessings; those who lived in those future times were to be consoled by the assurances of the favor of God through the Messiah (compare the notes at Isaiah 40:1).

(d) Strengthen ye the weak hands, and confirm the feeble knees.
(d) He wills all to encourage one another, and especially the ministers to exhort and strengthen the weak, that they may patiently abide the coming of God, which is at hand.

Strengthen ye the weak hands,.... 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 so they may keep their ground against their enemies; shake off their fears and trembling; go on their way courageously and rejoicing; run, and not be weary; walk, and not faint: "hands" and "knees" are mentioned particularly, because a man's strength lies greatly in them; and his weakness is seen by the languor and trembling of them.

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.

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 similar to that in Isaiah 30:27; Isaiah 13:9, cf., Isaiah 40:10, but a bolder one; the words in apposition stand as abbreviations of final clauses). The infliction of punishment is the immediate object of His coming, but the ultimate object is the salvation of His people (וישעכם a contracted future form, which is generally confined to the aorist).

Strengthen - Ye ministers of God, comfort and encourage God's people, who are now ready to faint.