At one time the blood of bulls and goats and the ashes of a heifer was sprinkled over the unclean which then sanctified and purified the flesh that was subject to sin.During the passover Jesus spoke of the new testament in His blood that has the power to cleanse the sinner!(Luke 22:13-20).13 And they went, and found as he had said unto them: and they made ready the passover.14 And when the hour was come, he sat down, and the twelve apostles with him.15 And he said unto them, With desire I have desired to eat this passover with you before I suffer:16 For I say unto you, I will not any more eat thereof, until it be fulfilled in the kingdom of God.17 And he took the cup, and gave thanks, and said, Take this, and divide it among yourselves:18 For I say unto you, I will not drink of the fruit of the vine, until the kingdom of God shall come.19 And he took bread, and gave thanks, and brake it, and gave unto them, saying, This is my body which is given for you: this do in remembrance of me.20 Likewise also the cup after supper, saying, This cup is the new testament in my blood, which is shed for you.

Only the blood of Christ can cleanse the conscience of a sinner so they are able to serve the living God(Hebrews 9:11-15).11 But Christ being come an high priest of good things to come, by a greater and more perfect tabernacle, not made with hands, that is to say, not of this building;12 Neither by the blood of goats and calves, but by his own blood he entered in once into the holy place, having obtained eternal redemption for us.13 For if the blood of bulls and of goats, and the ashes of an heifer sprinkling the unclean, sanctifieth to the purifying of the flesh:14 How much more shall the blood of Christ, who through the eternal Spirit offered himself without spot to God, purge your conscience from dead works to serve the living God?15 And for this cause he is the mediator of the new testament, that by means of death, for the redemption of the transgressions that were under the first testament, they which are called might receive the promise of eternal inheritance.

The greatest testamony ever made was when our Lord and saviour sacrificed His life for the salvation of many.