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From LSJ

μήτε δίκην δικάσῃς πρίν ἀμφοῖν μῦθον ἀκούσῃς → do not give your judgement until you have heard a speech on both sides

Source

English (Woodhouse)

craftily, cunningly, by craft, by subtlety, by treachery, in an underhand way

⇢ Look up on Google | Wiktionary | LSJ full text search (Translation based on the reversal of Woodhouse's English to Ancient Greek dictionary)