Plato, Laws 856a

δοκῇ, γράμμασιν σημεῖα ἐπιβάλλοντας πάντων τῶν δικαστῶν, θεῖναι ἐπὶ τὴν ἑστίαν, καὶ πάλιν αὔριον εἰς ταὐτὸν συνελθόντας, ὡσαύτως τε ἀνακρίνοντας διεξελθεῖν τὴν δίκην καὶ σημεῖα ἐπιβάλλοντας αὖ τοῖς λεχθεῖσιν· καὶ τρὶς δράσαντας τοῦτο, τεκμήριά τε καὶ μάρτυρας ἱκανῶς παραλαβόντας, ψῆφον ἱερὰν ἕκαστον φέροντα καὶ ὑποσχόμενον πρὸς τῆς ἑστίας εἰς δύναμιν τὰ δίκαια καὶ ἀληθῆ κρίνειν, οὕτω τέλος ἐπιθεῖναι τῇ τοιαύτῃ δίκῃ.

of all the judges, they shall lay them up at the altar of Hestia. On the morrow again they shall assemble at the same place and discuss the case, and they shall make their pronouncements in the same manner, and shall again sign the statements. And after doing this thrice,—during which proceedings they shall pay full attention to evidence and witnesses,—each of the judges shall cast a sacred vote, promising by Hestia to give just and true judgment to the best of his power; and thus they shall bring to its end this form of trial.