But if you refuse and rebel, you shall be devoured with the sword:
for the mouth of the LORD has spoken it.
All Commentaries on Isaiah 1:20 Go To Isaiah 1
Justin Martyr
AD 165
The phrase “the sword shall devour you” does not mean that sinners will be killed by swords but that God’s sword is the fire which is fueled by those who by their own volition do evil.… For were he to be speaking of a sword that cuts and immediately kills, he would not have said, “will devour.”