Plato, Laws 949b

ἐπιτρέπειν μήτε ὀμνύντι λέγειν πιθανότητος χάριν μήτε ἐπαρώμενον ἑαυτῷ καὶ γένει μήτε ἱκετείαις χρώμενον ἀσχήμοσιν μήτε οἴκτοις γυναικείοις, ἀλλὰ τὸ δίκαιον μετʼ εὐφημίας διδάσκοντα καὶ μανθάνοντα ἀεὶ διατελεῖν, εἰ δὲ μή, καθάπερ ἔξω τοῦ λόγου λέγοντος, τοὺς ἄρχοντας πάλιν ἐπανάγειν εἰς τὸν περὶ τοῦ πράγματος ἀεὶ λόγον. ξένῳ δʼ εἶναι πρὸς ξένους, καθάπερ τὰ νῦν, δέχεσθαί τε ὅρκους παρʼ

by trials without oaths. And in general, during a trial, the presidents of the court shall not permit a man to speak under oath for the sake of gaining credence, or to imprecate curses upon himself and his family, or to make use of unseemly supplications and womanish sobbings, but only and always to state and hear what is just in proper language; otherwise, the magistrate shall check him for digressing from the point, and shall call him back to deal with the matter in hand. In the case of resident aliens dealing with aliens, it shall be permitted them, as now, to give and receive oaths of a binding character one from another, if so they choose,—