There is no precedent in Old Testament with regards to the sin offerings, which supports the theology that Jesus became sinful when he died on the cross.
The offerings for sin, which foreshadowed Jesus’ death, were NOT made sinful with the sins of the people and consequently rejected by God. Instead they were to be offered as unblemished sacrifices which were holy gifts to the Lord and they were accepted by God as a sweet fragrance.
Leviticus 6:25 says, Speak unto Aaron and to his sons, saying, THIS IS THE LAW OF THE SIN OFFERING: In the place where the burnt offering is killed shall THE SIN OFFERING BE KILLED before the Lord: IT IS MOST HOLY.
The sin offering was to be KILLED as a MOST HOLY OFFERING.
This was a foreshadowing of Jesus, who died, not as one who had been made sin with our sinfulness, but made a sin offering instead, a MOST HOLY offering to the Lord.
When Paul says in 2 Corinthians 5:21, “Christ was made to be sin for us,” he is not teaching that Christ metamorphosed into something unholy. Rather, he is echoing the truth of scripture: Christ was made a sin offering for us.
In both, the Old Testament Hebrew, and the New Testament Greek, the words “sin” and “sin offering” come from the same root word. That is why Paul, as does the author of Hebrews, uses the word ““hamartia” for “sin” as well as “sin offering” (see Hebrews 10:6). Paul is not teaching that Christ was made our literal sin, but our SIN OFFERING instead.
Jesus was MOST HOLY when he was killed. He redeem us with his precious blood as of a lamb without blemish and without spot.