Romans 7:6 - Matthew Poole's English Annotations on the Holy Bible

But now; i.e. being brought out of our fleshly state. We are delivered from the law: see the notes on Romans 7:4. That being dead wherein we were held; the relative is not in the Greek text, but it is well supplied to fill up the sense. The antecedent must be either sin or the law; by both of these we were held or detained whilst unregenerate; but now neither of these have any power to hold us with. Some read it, he being dead; the old man, of which he spake in the foregoing chapter. That we should serve in newness of spirit; i.e. that we should serve God, or Jesus Christ, our new husband, in true holiness, which is wrought in us by the renewing of the spirit; or serve him in a new spiritual manner. And not in the oldness of the letter; i.e. not in an outward and ceremonial manner, according to the letter of the law; which service, or way of worship, is now antiquated, and grown out of date. The word oldness insinuates the abolishing thereof, because of insufficiency, Hebrews 8:13.