Romans 3:19-20

3:19 Now we know that whatever the law says, it says to those who are under the law, so that every mouth may be silenced and the whole world may be held accountable to God. 3:20 For no one is declared righteous before him by the works of the law, for through the law comes the knowledge of sin.

Romans 3:25

3:25 God publicly displayed him at his death as the mercy seat accessible through faith. This was to demonstrate his righteousness, because God in his forbearance had passed over the sins previously committed.