Who did no sin (hos hamartian ouk epoiēsen). Quotation from Isa 53:9. He has already expressed the sinlessness of Christ in 1Pe 1:19. The next clause is a combination of Isa 53:9; Zep 3:13. For “guile” (dolos) see 1Pe 2:1.
Was found (heurethē). First aorist passive indicative of heuriskō. Christ’s guilelessness stood the test of scrutiny (Vincent), as Peter knew (Mat 26:60; Joh 18:38; Joh 19:4, Joh 19:6).