{Will burn up with unquenchable fire} (katakausei puri
asbest(9369)). Note perfective use of kata. The threshing floor,
the fan, the wheat, the garner, the chaff (achuron, chaff,
straw, stubble), the fire furnish a life-like picture. The "fire"
here is probably judgment by and at the coming of the Messiah
just as in verse  11 . The Messiah "will thoroughly cleanse"
(diakathariei, Attic future of -iz(935c) and note dia-). He will
sweep from side to side to make it clean.