Matthew 5:37

Let your communication be, Yea, yea; Nay, nay - That is, a positive affirmation, or negation, according to your knowledge of the matter concerning which you are called to testify. Do not equivocate; mean what you assert, and adhere to your assertion. Hear what a heathen says on this subject: -

Εχθρος γαρ μοι κεινος ὁμως αιδαο πυλησιν ,

Ος χ ' ετερον μεν κευθει ενι φρεσιν, αλλο δε βαζει .

Hom. Il. ix. 312