By which Spirit he preached — Through the ministry of Noah. To the spirits in prison — The unholy men before the flood, who were then reserved by the justice of God, as in a prison, till he executed the sentence upon them all; and are now also reserved to the judgment of the great day.
Related Commentaries of 1 Peter 3:19
1 Peter 3:19
19 By which also he went and preached unto the spirits in prison;