it was to prove at the present time that he himself is righteous and that he justifies the one who has faith in Jesus.
References for Romans 3:26
Then what becomes of boasting? It is excluded. By what law? By that of works? No, but by the law of faith.
For we hold that a person is justified by faith apart from works prescribed by the law.
Or is God the God of Jews only? Is he not the God of Gentiles also? Yes, of Gentiles also,
since God is one; and he will justify the circumcised on the ground of faith and the uncircumcised through that same faith.
Do we then overthrow the law by this faith? By no means! On the contrary, we uphold the law.