Kehillah in Rome 4:5

5 But to the man who does not "work" but has emunah and bitachon in the One who takes the impious man lacking chasidus and accounts him to be YITZDAK IM HASHEM (justified with G-d), such a man who does not "work " but has emunah (faith), such emunah is credited to him for TZEDAKAH ("righteousness" BERESHIS 15:6).