GEN997 The twin characteristics of righteous giving (tzedakah) and truthful justice (mishpat) are the legacy of Avrham Avinu, [this verse], the foundation of the Torah, and an emulation of Hashem’s Providence. Tehillim 33:5, from whence is derived the eleventh berachah of Shemonah Esrei. See also Succah 49b.   The specific mitzvah of tzedakah is intrinsically related to righteous tzedakah in the wider sense which is one of the foundations of Hashem’s Providence. Thus, the Sages used superlatives when describing the mitzvah of tzedakah … The mitzvah of tzedakah requires more heedfulness than does any other positive commandment, since this mitzvah is the sign of a righteous descendant of Abraham, as the Torah says, For I know him that he will command his children … to guard justice and tzedakah” [this verse]. Ramban, Hilchos Matnos Aniyim 10:1. EHRMAN 457-8