This [is] the ordinance of the law which the LORD hath commanded, saying, Speak unto the children of Israel, that they bring thee a red heifer without spot, wherein [is] no blemish, [and] upon which never came yoke… – Numbers 19:2

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? – Hebrews 9:14

Now, my brethren, I want you, for a moment, to remember that our Lord Himself was spotless, pure and perfect. And yet—speak it with bated breath—God “has made Him to be sin for us,” even Him who knew no sin. Whisper it with still greater awe, “He was made a curse for us”—yes, a curse, as it is written, “Cursed is everyone that hangs on a tree.” That red heifer, though without spot and never having borne a yoke, was regarded as a polluted thing. Take it out of the camp. It must not live. Kill it. It is a polluted thing; burn it right up, for God cannot endure it! Behold and wonder that God’s own Ever-Blessed, adorable Son in inconceivable condescension of unutterable love, took the place of sin, the place of the sinner—and was numbered with the transgressors!

He must die! Hang Him up on a cross! He must be forsaken of men and even deserted of God! “It pleased the Father to bruise Him; He has put Him to grief; He shall make His soul an offering for sin.” “All we, like sheep, have gone astray; we have turned, everyone, to his own way and the Lord has laid on Him the iniquity of us all”—not merely the punishment, but the iniquity, the very sin itself was laid upon the Ever-Blessed! The wise men of our age say it is impossible that sin should be lawfully imputed to the innocent. That is what the philosophers say, but God declares that it was done! “He has made Him to be sin who knew no sin.” Therefore, it was possible! Yes, it is done! It is finished! The Sacrifice, then, is much greater. “How much more,” we may cry exultingly as we think of it, “shall the blood of Christ, who through the Eternal Spirit offered Himself without spot to God, purge our conscience from dead works to serve the living God?” ~ C.H. Spurgeon

https://www.blueletterbible.org/comm/spurgeon_charles/sermons/1481.cfm