The repeated sacrificial offerings of animals found in Leviticus could never take away sins, brethren. The penalty for mankind's sin is mankind's death. The value of the life of an animal was not even close to the value of the life of a person.
This one payment was so large it will satisfy the cost of all the sins of all mankind, for all of the world, for all of time. When Jesus Christ, God the Son, came into the world, God provided Him a human body, we read here, which enabled Him to serve God's will and be our sacrifice once for all.