By which will we have been sanctified through the offering of the body of Jesus Christ once for all.
By--Greek, "In." So "in," and "through," occur in the same sentence, Pe1 1:22, "Ye have purified your souls in obeying the truth through the Spirit." Also, Pe1 1:5, in the Greek. The "in (fulfilment of) which will" (compare the use of in, Eph 1:6, "wherein [in which grace] He hath made us accepted, in the Beloved"), expresses the originating cause; "THROUGH the offering . . .
By the which will we are sanctified,.... That is, by the sacrifice of Christ, which was willingly offered up by himself, and was according to the will of God; it was his will of purpose that Christ should be crucified and slain; and it was his will of command, that he should lay down his life for his people; and it was grateful and well...
Verse 10. By the which will. That is, by his obeying God in the manner specified. It is in virtue of his obedience that we are sanctified. The apostle immediately specifies what he means, and furnishes the key to his whole argument, when he says that it was through the offering of the body of Jesus Christ.