Under the law offerings must be without blemish. Therefore, the LORD reproves the people for that they brought that which was torn and the lame and the sick, saying, "Ye brought an offering, should I accept this of your hands saith the LORD?" (Malachi 1:8) It is as much as if He had said, "I the LORD delight not in but abhor lame, blind, imperfect offerings. I must have one without blemish.”

But now seeing that all these unblemished lambs, etc., under the law could not take away sin, either a sacrifice without spot and blemish must be found, that is sufficient to take away sin or else sin must remain. Therefore, the LORD Christ stepped in and it is said, “Wherefore when He cometh into the world, He saith, Sacrifice and offerings thou wouldest not. Then said I, Lo I come to do Thy will O God. Christ is the Lamb of God that taketh away the sins of the world. Who offered up Himself to God without spot, for He is that true Lamb without blemish and without spot.”(Hebrews 10:5-10)

Herein our Jesus was a Priest transcending the priests under the law, which had infirmity and the sacrifices under the law that were imperfect. For the LORD Jesus was pure and spotless, yea, perfectly pure, in Whose mouth was found no guile, Who knew no sin: [Lev. 1:3-10; Mal. 1:7-10; John 1:29-36; Heb. 9:14; 1 Pet. 1:19; Heb. 7:28; Heb. 11:19; 1 Pet. 2:22; 2 Cor. 5:21].

There was a great necessity that He should be such an offering without spot because God was and is a God of pure eyes that cannot behold iniquity, that is to say, to tolerate it, suffer it to go unpunished. Now had Christ been a sinner, He could not have taken away sin.