μήτε δίκην δικάσῃς πρίν ἀμφοῖν μῦθον ἀκούσῃς → do not give your judgement until you have heard a speech on both sides
percontātor: (percunct-), ōris, m. id.,
I an asker, inquirer, Plaut. Men. 5, 5, 31: percontatorem fugito; nam garrulus idem est, Hor. Ep. 1, 18, 69.