Adam Clarke on Isaiah 10:17

And it shall burn and devour his thorns "And he shall burn and consume his thorn" - The briers and thorns are the common people; the glory of his forest are the nobles and those of highest rank and importance. See note on Isa 9:17, and compare Eze 20:47. The fire of God's wrath shall destroy them, both great and small; it shall consume them from the soul to the flesh; a proverbial expression; soul and body, as we say; it shall consume them entirely and altogether; and the few that escape shall be looked upon as having escaped from the most imminent danger; "as a firebrand plucked out of the fire," Amo 4:11; ὡς δια πυρος, so as by fire, 1Cor 3:15; as a man when a house is burning is forced to make his escape by running through the midst of the fire.

I follow here the reading of the Septuagint, כמאש נסס kemash noses, ὡς ὁ φευγων απω φλογος χαιομενης, as he who flees from the burning flame. Symmachus also renders the latter word by φευγων, flying.