Matthew 3:3

Irenaeus Against Heresies Book III

Every valley shall be filled, and every mountain and hill brought low; and the crooked shall be made straight, and the rough into smooth ways; and all flesh shall see the salvation of God."[69]

Tertullian On Baptism

of baptism, "make the paths straight"[46]

Pseudo-Gregory Thaumaturgus Fourth Homily

I cannot keep silence while Thou art present, for I am a voice; yea, I am the voice, as it is said, of one crying in the wilderness, Prepare ye the way of the Lord.[9]

Gospel of Nicodemus II The Descent of Christ into Hell

Then there came into the midst another, an ascetic from the desert; and the patriarchs said to him: Who art thou? And he said: I am John, the last of the prophets, who made the paths of the Son of God straight,[3]