Exodus 12:1-6

12 And the Lord spake unto Moses and Aaron in the land of Egypt, saying,

2 This month shall be unto you the beginning of months: it shall be the first month of the year to you.

3 Speak ye unto all the congregation of Israel, saying, In the tenth day of this month they shall take to them every man a lamb, according to the house of their fathers, a lamb for an house:

4 And if the household be too little for the lamb, let him and his neighbour next unto his house take it according to the number of the souls; every man according to his eating shall make your count for the lamb.

5 Your lamb shall be without blemish, a male of the first year: ye shall take it out from the sheep, or from the goats:

6 And ye shall keep it up until the fourteenth day of the same month: and the whole assembly of the congregation of Israel shall kill it in the evening.

KJV

Romans 12:1-2

12 I beseech you therefore, brethren, by the mercies of God, that ye present your bodies a living sacrifice, holy, acceptable unto God, which is your reasonable service.

2 And be not conformed to this world: but be ye transformed by the renewing of your mind, that ye may prove what is that good, and acceptable, and perfect, will of God.

KJV

In the Old Testament, God required sacrifices to make the people think about the consequences of sin.  The sacrifice was costly.  With a scarcity of resources an unblemished lamb was costly.  This was ordained to synchronize the soul.  The sacrifice brought awareness to the spirit about the depravity of sin and the need for God, specifically a savior.

In the New Testament, what does God require?   God requires a sacrifice of the Spirit.  He already died for our sins.  He is the sin sacrifice.  He still requires a sacrifice from us though.  It’s no longer for our sins, it’s in appreciation of His grace and mercy.  What do we give now?  How much do we give?  Answer:  We give our lives and we give in remembrance of the unblemished lamb.  We give until it hurts and then some.