NET

6 We know that our old man was crucified with him so that the body of sin would no longer dominate us, so that we would no longer be enslaved to sin.

Darby

6 knowing^D8045 this, that our old man has been crucified with [him], that the body of sin might be annulled, that we should no longer serve^D8046 sin.

Darby Bible Notes

knowing - In ver. 6 it is objective knowledge, ginosko. In vers. 9 and 16 it is conscious knowledge, oida. See Note to 1Cor. 8.1. serve - i.e. serve as bondmen.

KJV

6 Knowing this, that our old man is crucified with [him], that the body of sin might be destroyed, that henceforth we should not serve sin.