The basic Old Testament elements involved in a sacrifice for sin are: confession of sin, bringing an animal which has no defect, lay hands on its head,
slay the animal, blood is collected, fat portions are burned on the altar, and the meat is eaten by the priests.
The only one which is still necessary for forgiveness of sins today is the confession of sin. The principle we follow today if somebody miss the mark is in
1 John 1:9 which says: "If we confess our sins, he is faithful and just and will forgive us our sins and purify us from all unrighteousness."
Apart from the confession of sins the rest are rendered null and void because Jesus paid the price for the sins of mankind. No amount of animal sacrifices
can take the effects of the sins of the world. Galatians 3:13 says, Christ redeemed us from the curse of the law by becoming a curse for us, for it is written: "Cursed is everyone who is hung on a tree." Verse 14 says, "He redeemed us in order that the blessing given to Abraham might come to the Gentiles through Christ Jesus, so that by faith we might receive the promise of the Spirit. " Glory to the Lamb of God
No more animal sacrifices. It is abrogated. Jesus has become our new paschal lamb. Alleluia!