Jesus had to be made sin for us so we can become the righteousness of God

What then? Shall we sin because we are not under law but under grace? Certainly not!

16 Do you not know that to whom you present yourselves slaves to obey, you are that one’s slaves whom you obey, whether of sin leading to death, or of obedience leading to righteousness?

17 But God be thanked that though you were slaves of sin, yet you obeyed from the heart that form of doctrine to which you were delivered.

18 And having been set free from sin, you became slaves of righteousness.

19 I speak in human terms because of the weakness of your flesh. For just as you presented your members as slaves of uncleanness, and of lawlessness leading to more lawlessness, so now present your members as slaves of righteousness for holiness.