ISB ~ Philippians 3 v9

righteousness:A distinction is made between legal righteousness, which persons under the Old Covenant tried to attain by faithfulness to the Law (Deut 6:25), and divine righteousness, which we receive through faith in Jesus Christ under the New Covenant (Rom 5:17). For Paul, legal righteousness is not a saving righteousness because it depends on human effort apart from the inward grace of God. This distinction is also set forth in Rom 9:30-32 and 10:3.See note on Mt 5:20.