εἴτην

From LSJ

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

Source

French (Bailly abrégé)

3ᵉ duel prés. opt. de εἰμί.