points back to that Passover event

This event also uses language similar to the Exodus of the Jews. It not only points forward to the final consummation but also points back to that Passover event. This passage actually lifts language from the Book of Exodus, interpreting its ultimate meaning. What actually took place on the evening of the first Passover? A lamb was slain and painted on the doorposts of every Jewish home. That was the event. But what was the meaning of that event?. The text is clear. The purchase of the firstborn for God. The firstborn in Israel were just as guilty as any Egyptian. The Jews were not saved because they were more righteous than anyone else. They were saved because God made them a provision of atonement. They too were liable to the death blow of the angel, but were purchased by the blood of an unblemished sacrifice that pointed to the ultimate sacrifice. To what end, and with what final consequence in mind? In their language: “That out of all the nations of the world they would become the personal possession of God, purchased out of Egypt to be made a kingdom and priests” (Ex 19).

Revelation 5:9-10

(via: this T-Shirt @ Monergism.com, and Concepts from Art Azurdia and Dennis Johnson.)