Romans 6:16 Do you not know that if you present yourselves to anyone as obedient slaves, you are slaves of the one whom you obey, either of sin, which leads to death, or of obedience, which leads to righteousness?
The distinction Paul makes in this verse is between believers and non-believers. Paul makes the point that everyone is either a slave to sin or obedience that leads to righteousness. The obedience that leads to righteousness is a result of the new covenant promise of a new heart. Through regeneration by the Holy Spirit and the leading of the Holy Spirit, believers have a new nature that causes them to pursue righteousness through obedience to Christ. Please note the fruit of righteousness is a result of regeneration and not the cause of it.
Focus on Christ #131