| Barnes' Notes on the Bible The Lord God will help me - (See Isaiah 50:7). In the Hebrew this is, 'The Lord Jehovah,' as it is in Isaiah 50:7 also, and these are among the places where our translators have improperly rendered the word יהוה yehovâh (Jehovah) by the word 'God.' Who is he that shall condemn me? - If Yahweh is my advocate and friend, my cause must be right. Similar language is used by the apostle Paul: 'If God be for us, who can be against us?' Romans 8:31; and in Psalm 118:6 : Jehovah is on my side; I will not fear: What can man do unto me? They all shall wax old - All my enemies shall pass away, as a garment is worn out and cast aside. The idea is, that the Messiah would survive all their attacks; his cause, his truth and his reputation would live, while all the power, the influence, the reputation of his adversaries, would vanish as a garment that is worn out and then thrown away. The same image respecting his enemies is used again in Isaiah 51:8. The moth shall eat them up - The moth is a well known insect attached particularly to woolen clothes, and which soon consumes them (see the note at Job 4:19). In eastern countries, where wealth consisted much in changes of raiment, the depredations of the moth would be particularly to be feared, and hence, it is frequently referred to in the Bible. The sense here is, that the adversaries of the Messiah would be wholly destroyed.
Gill's Exposition of the Entire BibleBehold, the Lord God will help me,.... This is repeated from Isaiah 50:7; see Gill on Isaiah 50:7; to show the certainty of it, the strength of his faith in it, and to discourage his enemies: who is he that shall condemn me? make me out a wicked person (c), prove me guilty, and pass sentence upon me, when thus acquitted and justified by the Lord God? The Apostle Paul seems to have some reference to this passage in Romans 8:33, lo, they all shall waste old as doth a garment; his enemies, those that accused him, the Scribes, Pharisees, and chief priests; and those that condemned him, the Jewish sanhedrim, and the Roman governor: the moth shall eat them up; they shall be like a worn out or motheaten garment, that can never be used more. The phrases denote how secret, insensible, and irrecoverable, their ruin should be, both in their civil and church state, all being abolished and done away. (c) "quis ipse impium faciet me", Pagninus, Montanus; "impium vel praevaricatorem et iniquum faciet me", Vatablus.
Geneva Study BibleBehold, the Lord GOD will help me; who is he that shall condemn me? lo, they all shall wax old as a garment; the moth shall eat them up.
Wesley's Notes 50:9 They - Mine accusers and enemies. The moth - Shall be cut off and consumed by a secret curse.
Jamieson-Fausset-Brown Bible Commentary9. (Compare "deal," or "proper," Isa 52:13, Margin; Isa 53:10; Ps 118:6; Jer 23:5). as a garment-(Isa 51:6, 8; Ps 102:26). A leading constituent of wealth in the East is change of raiment, which is always liable to the inroads of the moth; hence the frequency of the image in Scripture.
Matthew Henry's Concise Commentary50:4-9 As Jesus was God and man in one person, we find him sometimes speaking, or spoken of, as the Lord God; at other times, as man and the servant of Jehovah. He was to declare the truths which comfort the broken, contrite heart, those weary of sin, harassed with afflictions. And as the Holy Spirit was upon him, that he might speak as never man spake; so the same Divine influence daily wakened him to pray, to preach the gospel, and to receive and deliver the whole will of the Father. The Father justified the Son when he accepted the satisfaction he made for the sin of man. Christ speaks in the name of all believers. Who dares to be an enemy to those unto whom he is a Friend? or who will contend with those whom he is an Advocate? Thus St. Paul applies it, Ro 8:33. | 
