'Double edged' in the Bible

He held seven stars in his right hand, and a sharp double-edged sword extended out of his mouth. His face shone like the sun shining at full strength.

"To the angel of the church in Pergamum write the following: "This is the solemn pronouncement of the one who has the sharp double-edged sword:

Out of his mouth proceeds a sharp, double-edged sword, that with it he should strike the nations. He will rule them with an iron rod. He treads the winepress of the fierceness of the wrath of God, the Almighty.