Because Christ also suffered for sins once, the righteous for the unrighteous, that he might bring you to God; being put to death in the flesh, but made alive in the spirit;
But who did the making alive?  This also is easily resolved.  It was achieved by "the spirit of holiness"  (Romans 1:4), as Paul said, significantly using the expression in connection with "the flesh" of Christ which was of the seed of David, much as Peter referred to "flesh" which was crucified.  It was through that same "eternal spirit" that Christ offered himself to God (in the crucifixion)  (Hebrews 9:24); and by that very same Holy Spirit that he was conceived in the womb of Mary  (Matthew 1:20). In fact, the very Spirit which indwelt Christ throughout his earthly sojourn was the Holy Spirit dwelling in him without measure (John 3:31), and so uniquely associated with Christ that the Holy Spirit could not even come to the earth to dwell in the apostles until Christ should go back to heaven!  (John 16:7).  There is thus little doubt, therefore, that it was the Holy Spirit who raised Christ from the dead, and the translators could have saved a lot of misunderstanding if they had capitalized Spirit in this passage.  We reject the intricate arguments from the "antithesis" in the Greek text which is said to refute this; because, as Barnes said, "So far as the mere use of this word (spirit) is concerned, it might easily refer to his own soul, to his divine nature, or to the Holy Spirit."[30] Men who speak learnedly about the alleged difference between the divine nature of Christ, his human soul, and the blessed Holy Spirit which was in Christ throughout his earthly sojourn are unconvincing.