John Gill expounds on the priestly office of Christ, emphasizing that His role as a priest was predetermined by God to serve as a propitiatory sacrifice for sin, fulfilling the requirements of divine justice. He highlights that Christ's priesthood is eternal and superior, established not through the law of Moses but through the order of Melchizedek, and that His sacrifice was unique, sufficient, and voluntary, offering redemption for His people. Gill also discusses the dual nature of Christ as both God and man, which qualifies Him to mediate and intercede for humanity, ultimately securing eternal salvation for those who believe.