Irenaeus Against Heresies Book IV

And, "It hath been said, Thou shalt not forswear thyself. But I say unto you, Swear not at all; but let your conversation be, Yea, yea, and Nay, nay."[154]

Constitutions of the Holy Apostles Book VI

He who made a law for swearing rightly, and forbade perjury, has now charged us not to swear at all.[146]

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Old Testament