The Pulpit Commentary - Isaiah 19:20
It shall be for a sign . The outward tokens of Jehovah-worship shall witness to God that he has in Egypt now a covenant people, and he will deal with them accordingly. He shall send them a savior, and a great one. This does not seem to point to any earthly deliverer, but to the Savior from the worst of all oppressors, sin and Satan, whom they will need equally with the rest of his people. read more
The Pulpit Commentary - Isaiah 19:19
The cry of distress after the true God. The erection of the altar and the pillar would be a sign of desire after God. "In Isaiah's time it must have seemed incredible that the firmly organized idolatrous system of Egypt should ever be broken up. Yet such a result was brought about by a series of movements—Assyrian, Babylonian, Persian, and Greek—which commenced almost immediately after the date of the above prediction. In the district of Heliopolis, on the site of a ruined temple at... read more