NET
21 I do not set aside God’s grace, because if righteousness could come through the law, then Christ died for nothing!
Darby
21 I do not set aside the grace of God; for if righteousness [is] by law, then Christ has died for nothing.
KJV
21 I do not frustrate the grace of God: for if righteousness [come] by the law, then Christ is dead in vain.