John Gills Exposition of the Bible Commentary - Isaiah 66:19
And I will set a sign among them ,.... Either a miraculous sign, something wonderful, as the word is often used, Exodus 4:8 , not the effusion of the Spirit on the day of Pentecost, in the presence of men of all nations; or the miracles wrought in the Gentile world by the apostles, in confirmation of the Gospel; but rather the wonderful conversion of the Jews, Isaiah 66:8 , or those wonders, the time of the end of which is inquired, Daniel 12:6 or else some distinguishing sign or mark... read more
Matthew Henry's Complete Commentary - Isaiah 66:15-24
These verses, like the pillar of cloud and fire, have a dark side towards the enemies of God's kingdom and all that are rebels against his crown, and a bright side towards his faithful loyal subjects. Probably they refer to the Jews in captivity in Babylon, of whom some are said to have been sent thither for their hurt, and with them God here threatens to proceed in his controversy; they hated to be reformed, and therefore should be ruined by the calamity (Jer. 24:9); others were sent thither... read more