Matthew 5:37

Tertullian The Prescription Against Heretics

Moreover, they remembered the words): "Let your communication be yea, yea; nay, nay; for whatsoever is more than this cometh of evil; "[289]

Tertullian On the Flesh of Christ

Light is light; and darkness, darkness; yea is yea; and nay, nay; "whatsoever is more than these cometh of evil."[318]

Tertullian Against Praxeas

For, of course, all things will be what their names represent them to be; and what they are and ever will be, that will they be called; and the distinction indicated by the names does not at all admit of any confusion, because there is none in the things which they designate. "Yes is yes, and no is no; for what is more than these, cometh of evil."[102]

Cyprian Epistle LIV

Already their case has been examined, already sentence concerning them has been pronounced; nor is it fitting for the dignity of priests to be blamed for the levity of a changeable and inconstant mind, when the Lord teaches and says, "Let your communication be, Yea, yea; Nay, nay."[55]

Clementine Homily III "But to those who think, as the Scriptures teach, that God swears, He said, `Let your yea be yea, and nay, nay; for what is more than these is of the evil one.'[54]

Clementine Homily XIX

Moreover, in giving advice, He said, `Let your yea be yea, and your nay nay; for what is more than these is of the evil one.'[8]