Romans 4:2

4:2 For if Abraham was declared righteous by the works of the law, he has something to boast about – but not before God.

Romans 4:5-6

4:5 But to the one who does not work, but believes in the one who declares the ungodly righteous, his faith is credited as righteousness.

4:6 So even David himself speaks regarding the blessedness of the man to whom God credits righteousness apart from works:

Romans 16:12

16:12 Greet Tryphena and Tryphosa, laborers in the Lord. Greet my dear friend Persis, who has worked hard in the Lord.