The sermon centers on the significance of the Passover lamb's blood as a foreshadowing of Christ's atoning sacrifice, emphasizing that it represents the only way to escape divine judgment. Drawing from Exodus 12, the message highlights the importance of faith and obedience in accepting God's provision, contrasting it with the Israelites' later disregard for proper sacrifices and urging listeners to avoid a similar hardening of the heart. Ultimately, the sermon underscores the unchanging power of Christ's blood to deliver from sin and eternal death, calling for unwavering trust and a commitment to seeking God's kingdom above all else, mirroring the Israelites' reliance on the blood as a token of God's protection.