For He hath made Him to be sin for us, who knew no sin; that we might be made the righteousness of God in Him. – 2 Corinthians 5:21

Now consider, who was made sin for us? The description of our great Surety here given is upon one point only, and it may more than suffice us for our present meditation. Our substitute was spotless, innocent, and pure. “He hath made Him to be sin for us, who knew no sin.” Christ Jesus, the Son of God, became incarnate, and was made flesh, and dwelt here among men; but though He was made in the likeness of sinful flesh, He knew no sin. Though upon Him sin was laid, yet not so as to make Him guilty. He was not, He could not be, a sinner: He had no personal knowledge of sin. Throughout the whole of His life, He never committed an offence against the great law of truth and right. The law was in His heart; it was His nature to be holy. He could say to all the world, “Which of you convinceth Me of sin?” Even His vacillating judge enquired, “Why, what evil has He done?” When all Jerusalem was challenged and bribed to bear witness against Him, no witnesses could be found. It was necessary to misquote and wrest His words before a charge could be trumped up against Him by His bitterest enemies. His life brought Him in contact with both tables of the law, but no single command had He transgressed. As the Jews examined the Paschal lamb before they slew it, so did scribes and Pharisees, and doctors of the law, and rulers and princes, examine the Lord Jesus, without finding any offence in Him. He was the Lamb of God, without blemish and without spot. As there was no sin of commission, so was there about our Lord no fault of omission…You cannot say that there was any feature deficient in His perfect beauty. He was complete in heart, in purpose, in thought, in word, in deed, in spirit…His life is a perfect circle, a complete epitome of virtue. No pearl has dropped from the silver string of His character. No one virtue has overshadowed and dwarfed the rest: all perfections combine in perfect harmony to make in Him one surpassing perfection…Christ was made sin that sinners might be made righteousness. That is the doctrine of the substitution of our Lord Jesus Christ on the behalf of guilty men. ~ C.H. Spurgeon

https://www.blueletterbible.org/comm/spurgeon_charles/sermons/1910.cfm