When I see the blood, I will pass over you. This plague of death will not touch you when I strike the land of Egypt. Ex. 13:12
The next day John saw Jesus coming toward him and said, “Look! The Lamb of God who takes away the sin of the world! John 1:29
Christ, our Passover Lamb, has been sacrificed for us. I Cor. 5:7
The connections between the Exodus passages and the New Testament passages is clear. John, Peter, and Paul all saw how the Passover predicted the sacrifice of Christ. The lamb in Exodus is a type, corresponding to Christ in the NT. To a reasonable person, this is, in fact, reasonable.
I used this recently when talking to someone about the Lord. Sometimes we wonder how to get a conversation seated on a spiritual track. Here I used the interesting Bible story containing the type, then turned the conversation corner by essentially saying "In the same way..." to get to the all-important fulfillment in Jesus. The necessity of applying the lamb's blood was not optional to the Israelites. No blood, no avoiding the death angel. So it is now with the necessity of applying Christ's death to oneself. No Christ, no avoiding God's judgment.
When I See The Blood (Hymn)