Romans 3:19, 27

Now we know that whatever the Law [of Moses] says, it speaks to those who are under the Law, so that [the excuses of] every mouth may be silenced [from protesting] and that all the world may be held accountable to God [and subject to His judgment].

Then what becomes of [our] boasting? It is excluded [entirely ruled out, banished]. On what principle? On [the principle of good] works? No, but on the principle of faith.