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
John Cassian
AD 435
Moreover, we know that even holy people have been given over bodily to Satan or to great sufferings on account of some slight sins. For the divine clemency does not permit the least blemish or stain to be found in them on the day of judgment. According to the words of the prophet, which are in fact God’s, he purges away all the dross of their uncleanness in the present so that he may bring them to eternity like fire-tried gold or silver, in need of no penal cleansing.