John Gills Exposition of the Bible Commentary - Isaiah 19:19
In that day there shall be an altar to the Lord in the midst of the land of Egypt ,.... Josephus F3 Antiqu. l. 13. c. 3. sect. 1. 3. & de Bello Jud. l. 7. c. 10. sect. 2, 3, 4. , and other Jewish writers F4 T. Bab. Menachot, fol. 109. 2. , suppose this to be fulfilled when Onias, the son of Simeon the just, fled into Egypt, and obtained leave of Ptolemy king of Egypt, and Queen Cleopatra, to build a temple and an altar there, like those at Jerusalem, in order to draw the Jews... read more
Matthew Henry's Complete Commentary - Isaiah 19:18-25
Out of the thick and threatening clouds of the foregoing prophecy the sun of comfort here breaks forth, and it is the sun of righteousness. Still God has mercy in store for Egypt, and he will show it, not so much by reviving their trade and replenishing their river again as by bringing the true religion among them, calling them to, and accepting them in, the worship of the one only living and true God; and these blessings of grace were much more valuable than all the blessings of nature... read more