Isaiah 19:20

And it shall be for a sign -The altar, and the pillar. This shows that the altar was not to be for sacrifice, but was a “memorial,” or designed to designate a place of worship. They shall cry to the Lord because of the oppressors -That is, oppressed and borne down under the exactions of their rulers, they shall seek deliverance from the true God - one instance among many of the effect of affliction and oppression in leading people to embrace the true religion. And he shall send them a saviour -Who this “saviour” would be, has been a subject on which there has been a great difference of opinion.