John Gills Exposition of the Bible Commentary - Isaiah 19:21
And the Lord shall be known to Egypt ,.... The means of knowing him would be granted them; which were partly through the Bible being translated into the Greek language, at the request of Ptolemy king of Egypt, which was then understood in that country, and this was a considerable time before the coming of Christ; and chiefly through the Gospel being brought hither by the Evangelist Mark, and others, whereby many of them were brought to a spiritual, experimental, and evangelical knowledge of... 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