Exodus 9:27

saying, "I have sinned by delivering up an innocent man to die." But they replied, "What is that to us? It is your affair!"

But your stubbornness and refusal to repent are storing up wrath [i.e., punishment] for yourselves, [to be experienced] on the Day of Wrath [i.e., the day of judgment] when God's just judgment will be revealed.

Now we [all] know that everything the law says applies to those who are under [obligation to obey] that law, [Note: Here "the law" appears to refer to the Old Testament Scriptures generally, since Psalms and Isaiah are quoted. See verses 10-18]. This is so that the mouth of every objector may be stopped [i.e., from making excuses for his sin], and thereby bring the entire world under God's judgment [i.e., both Jews and Gentiles].