Римлянам 5:13

For until the law sin was in the world--that is during all the period from Adam "until the law" of Moses was given, God continued to treat men as sinners. but sin is not imputed where there is no law--"There must therefore have been a law during that period, because sin was then imputed"; as is now to be shown.

The apostle, having made good his point, and fully proved justification by faith, in this chapter proceeds in the explication, illustration, and application of that truth. I. He shows the fruits of justification (Rom 5:1-5). II. He shows the fountain and foundation of justification in the death of Jesus Christ, which he discourses of at large in the rest of the chapter.

5:13-14 Paul continues his explanation of “everyone sinned” (5:12) by stating that people who died between the times of Adam and Moses were not subject to specific commandments from God. Therefore, their condemnation was not only because of their own sin. It was because of their union with Adam, who sinned by violating an explicit commandment of God.