And he had in his right hand seven stars: and out of his mouth went a sharp two edged sword: and his countenance was as the sun shines in its strength.
All Commentaries on Revelation 1:16 Go To Revelation 1
Tertullian of Carthage
AD 220
Who will ply the sword without practising the contraries to lenity and justice; that is, guile, and asperity, and injustice, proper (of course) to the business of battles? See we, then, whether that which has another action be not another sword,-that is, the Divine word of God, doubly sharpened.
Now the Apostle John, in the Apocalypse, describes a sword which proceeded from the mouth of God as "a doubly sharp, two-edged one."