Isaiah 40:10

In Isa 40:10 the prophet goes back from the standpoint of the fulfilment to that of the prophecy. "Behold the Lord, Jehovah, as a mighty one will He come, His arm ruling for Him; behold, His reward is with Him, and His retribution before Him." We must not render the first clause "with strong," i.e., with strength, as the lxx and Targum do. The Beth is Beth essentiae (cf., Isa 26:4; Ges. 154, 3, a). He will come in the essence, strength, and energy of a strong one; and this is still further defined by the participial, circumstantial clause, "His arm ruling for Him" (brachio suo ipsi dominante). It is His arm that rules for Him, i.e., that either brings into subjection to Him, or else overthrows whatever opposes Him. Nevertheless, Isa 40:10 does not present Him merely in one aspect, namely as coming to judge and punish, but in both aspects, viz., that of the law and that of the gospel, as a righteous rewarder; hence the double name of God, Adonai Jehovah (compare Isa 3:15; Isa 28:16; Isa 30:15, all in the first part), which is used even in the Pentateuch, and most frequently by Amos and Ezekiel, and which forms, as it were, an anagram. פּעלּה is already met with in Lev 19:13 as a synonym of שׂכר, passing from the general idea of work to that of something earned and forfeited. Jehovah brings with Him the penal reward of the enemies of His people, and also the gracious reward of the faithful of His people, whom He will compensate for their previous sufferings with far exceeding joys (see Isa 62:11).

40:10 The Lord’s rule is not like that of the unjust and powerless rulers whom he will judge. It is compassionate, just, righteous, and powerful. • with a powerful arm: God manifested his power in events such as the defeat of the Egyptians (63:12), the judgment of his enemies (30:30; 48:14; 51:9), and the rescue of his people (59:16).