New Defender's Study Bible Notes
5:21 knew no sin. According to Paul, Christ “knew no sin.” Peter says He “did no sin” (I Peter 2:22) and John says that “in Him is no sin” (I John 3:5). Yet He was “made sin” for us, suffering and dying as the “propitiation…for the sins of the whole world” (I John 2:2), in order to reconcile God to sinful mankind. Then we are “made the righteousness of God,” being given credit before God for His perfect righteousness. No wonder Paul could say: “The love of Christ constraineth us” (II Corinthians 5:14).