John Gill explores 1 Peter 3:19, discussing the various interpretations of Christ's preaching to the spirits in prison. He argues against the notion that Christ's human soul descended to hell or a place called 'Limbus Patrum' to save the Old Testament saints, emphasizing that the text refers to Christ's divine nature and the spirits of the disobedient. Gill concludes that the passage likely refers to Christ preaching through Noah to the people of his time, who ultimately faced judgment for their disobedience. He highlights that Christ existed in his divine nature before his incarnation and actively fulfilled his role as Mediator even in the Old Testament. The sermon underscores the continuity of the Gospel message throughout biblical history.