The Apostle Paul
Romans 6:7ESV·traditional attribution

For one who has died has been set free from sin.

John Calvin Reformed @genevareformer

7. For he who has died, etc. This is an argument derived from what belongs to death or from its effect. For if death destroys all the actions of life, we who have died to sin ought to cease from those actions which it exercised during its life.

Matthew Henry Presbyterian @wholebiblehenry

The apostle's transition, which joins this discourse with the former, is observable: "What shall we say then? Rom 6:1. What use shall we make of this sweet and comfortable doctrine? Shall we do evil that good may come, as some say we do? Rom 3:8. Shall we continue in sin that grace may abound?

Commenting on Romans 6:1-23

John Gill Reformed Baptist @doctorgill

For he that is dead, is freed from sin. This is not to be understood of a natural or a corporeal death; for this is the effect of sin, and is inflicted by way of punishment for it, on Christless persons; so far is it from being an atonement for sin, as the Jews (t) fancy; besides, there are many persons, who as they die...