*Minor differences ignored. Grouped by changes, with first version listed as example.
Thou hast redeemed thy people by thy arm. The Psalmist here celebrates, above all the other wonderful works of God, the redemption of the chosen people, to which the Holy Spirit everywhere throughout the Scriptures invites the attention of true believers, in order to encourage them to cherish the hope of their salvation. It is well known that the power of God was at that time manifested to the Gentiles. The truth of history, indeed, through the artifice of Satan, was corrupted and falsified by many fables; but this is to be imputed to the wickedness of those in whose sight those wonderful works were wrought, who, although they saw them, chose rather to blind their eyes and disguise the truth of their existence, than to preserve the true knowledge of them. How can we explain the fact that they made Moses to be I know not what kind of a magician or enchanter, and invented so many strange and monstrous stories, which Josephus has collected together in his work against Apion, but upon the principle that it was their deliberate purpose to bury in forgetfulness the power of God? It is not, however, so much the design of the prophet to condemn the Gentiles of the sin of ingratitude, as to furnish himself and others of the children of God matter of hope as to their own circumstances; for at the time referred to, God openly exhibited for the benefit of all future ages a proof of his love towards his chosen people. The word arm is here put metaphorically for power of an extraordinary character, and which is worthy of remembrance. God did not deliver his ancient people secretly and in an ordinary way, but openly, and, as it were, with his arm stretched forth. The prophet, by calling the chosen tribes the sons of Jacob and Joseph, assigns the reason why God accounted them as his people. The reason is, because of the covenant into which he entered with their godly ancestors. The two tribes which descended from the two sons of Joseph derived their origin from Jacob as well as the rest; but the name of Joseph is expressed to put honor upon him, by whose instrumentality the whole race of Abraham were preserved in safety. [1]
1 - "The reason of Joseph's being coupled with Jacob is, that as the Israelites derived their birth from Jacob, so they were sustained by Joseph in Egypt, who became to them a second parent." -- Walford.
Thou hast with thine arm - That is, with strength or power, the arm being a symbol of strength. Exodus 6:6; Exodus 15:16; Psalm 10:15.
Redeemed thy people - Thou didst rescue or deliver them from Egyptian bondage. See the notes at Isaiah 43:3.
The sons of Jacob and Joseph - The descendants of Jacob and Joseph. Jacob is mentioned because he was the ancestor of the twelve tribes; Joseph, because he was conspicuous or eminent among the sons of Jacob, and particularly because he acted so important a part in the affairs of Egypt, from whose dominion they were redeemed.
The son. of Jacob and Joseph - "The sons which Jacob begat and Joseph nourished." says the Chaldee. The Israelites are properly called the sons of Joseph as well as of Jacob, seeing Ephraim and Manasseh, his sons, were taken into the number of the tribes. All the latter part of this Psalm refers to the deliverance of the Israelites from Egypt; and the psalmist uses this as an argument to excite the expectation of the captives. As God delivered our fathers from Egypt, so we may expect him to deliver us from Chaldea. It required his arm to do the former, and that arm is not shortened that it cannot save.
Thou hast with thine arm redeemed thy people,.... The people of Israel out of Egypt, which was typical of the redemption of the Lord's people by Christ, the arm and power of God:
the sons of Jacob and Joseph. Joseph is particularly mentioned for honour's sake, and because he was the means of supporting Jacob and his family in Egypt; and had special faith in their deliverance from thence; the Targum is,
"the sons whom Jacob begot, and Joseph nourished.''
Selah. See Gill on Psalm 3:2.
Jacob and Joseph--representing all.
*More commentary available at chapter level.