For his quote from Isaiah 53:9, Peter uses the Septuagint (the Greek translation of the Old Testament). However, he replaced the word the Septuagint uses for “sin” (literally, “lawlessness”) with the same word he had earlier used in 1 Peter 2:20, a word for “sin” that means “to err.” A slave may do his best, but he will make mistakes. Though Jesus never “erred,” he nevertheless suffered the penalty for alleged mistakes (and did it “for you”). If Jesus did not resist unjust suffering in the face of alleged errors, his followers ought not to protest unjust suffering in the face of real mistakes.
22 He committed no sin, neither was deceit found in his mouth.