Isaiah 53:7

7.He was punished. Here the Prophet applauds the obedience of Christ in suffering death; for if his death had not been voluntary, he would not have been regarded as having satisfied for our disobedience. “As by one man’s disobedience,” says Paul, “all became sinners, so by one man’s obedience many were made righteous. (Romans 5:19) And elsewhere, “He became obedient unto death, even the death of the cross.” (Philippians 2:8) This was the reason of his silence at the judgment­seat of Pilate, though he had a just defense to offer; for, having become answerable for our guilt, he wished to submit silently to the sentence, that we might loudly glory in the righteousness of faith obtained through free grace.

As a lamb shall he be led to the slaughter. We are here exhorted to patience and meekness, that, following the example of Christ, we may be ready to endure reproaches and cruel assaults, distress and torture. In this sense Peter quotes this passage, showing that we ought to become like Christ our Head, that we may imitate his patience and submissiveness. (1 Peter 2:23) In the word lamb there is probably an allusion to the sacrifices under the Law; and in this sense he is elsewhere called “the Lamb of God.” (John 1:29)