AUV(i)
20 This is because no human being can be considered right with God by [obeying] the requirements of a law. [Note: It is difficult to determine the exact sense in which “law” is used in these verses. It may be law generally, or the law of Moses specifically. See Bruce, pages 52-58]. For the knowledge of what sin is comes from the law of Moses.
21 But now [i.e., under the Gospel age], a way of being considered right with God apart from [any] law has been made known. [The writings of] the law [i.e., the Pentateuch] and the prophets bear witness to this.