κερδῶν ἄθικτος

From LSJ

Ἐσθλῷ γὰρ ἀνδρὶ τἆσθλὰ καὶ διδοῖ θεός → Bonis hominibus quid nisi bona det deus? → Dem edlen Mann gibt Gott auch das, was edel ist

Menander, Monostichoi, 141

Greek > English (Woodhouse)

impervious to bribery, not to be bribed