"Through faith he kept the passover, and the sprinkling of blood, lest he that destroyed the firstborn should touch them." (Hebrews 11: 28)
When we see the Passover, we need to recognize that there is more going on than just a lamb eaten, blood painted on doorposts.
Everything in the Old Testament testifies to Jesus, and the Finished Work He completed for us at the Cross.
He was punished for our sins, taking our place, the just for the unjust (1 Peter 3: 18)
Yet not only did the punishment for our sins pass over us to Someone else, we received the blessed standing of God's Son in His place:
"The next day John seeth Jesus coming unto him, and saith, Behold the Lamb of God, which taketh away the sin of the world." (John 1: 19)
Then we receive this revelation:
"16For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life. 17For God sent not his Son into the world to condemn the world; but that the world through him might be saved. 18He that believeth on him is not condemned: but he that believeth not is condemned already, because he hath not believed in the name of the only begotten Son of God." (John 3: 16-18)
Not just released from condemnation, we receive eternal life in Christ Jesus.
The Passover, the sprinkling of blood, all testify to the new glory, the grace of God which we receive through Jesus:
"Forasmuch as ye know that ye were not redeemed with corruptible things, as silver and gold, from your vain conversation received by tradition from your fathers; 19But with the precious blood of Christ, as of a lamb without blemish and without spot:" (1 Peter 1: 18-19)
"And they overcame him by the blood of the Lamb, and by the word of their testimony; and they loved not their lives unto the death." (Revelation 12: 11)
The Passover, the blood speaks not just of freedom from sin and death, but victory and new life, all of which we receive because of Jesus our Passover Lamb.