Romans 3:4-5

But let God be truthful, [even if] everyone [else] is a liar. For it is written [Psa. 51:4], "[God], you should be proven right when you speak, and win [your case] when put on trial."

Romans 3:19

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].

Treasury of Scripture Knowledge

Summary

O my people, what have I done unto thee? and wherein have I wearied thee? testify against me.

Testify

Bible References

Testify

Romans 3:4
But let God be truthful, [even if] everyone [else] is a liar. For it is written [Psa. 51:4], "[God], you should be proven right when you speak, and win [your case] when put on trial."