tongue ... condemn - image from a court of justice. Those who desire to “condemn” thee thou shalt “condemn” (Exo 11:7; Jos 10:21; Psa 64:8; Rom 8:1, Rom 8:33).
righteousness ... of me - (Isa 45:24; Isa 46:13). Rather, “(this is) their justification from Me.” Their enemies would “condemn” them, but I justify and vindicate them, and so they condemn their enemies.