‘In that day there will be five cities in the land of Egypt that speak the language of Canaan, and swear to Yahweh of hosts. One will be called ‘the city of destruction'.
When related to Egypt the number ‘five' is of especial significance. It contained within it the essence of completeness. Thus these ‘five cities' are like the ‘seven churches' of Revelation. They speak of five major cities, but as comprising all cities. And yet at the same time they are a reminder that just as it is ‘a remnant' of Israel that are the holy seed (Isaiah 6:13), so will it be of Egypt. Five cities are a significant fraction of the whole.
Furthermore Egyptians were very proud of their language. They regularly judged the manhood of others by whether they could speak Egyptian. They considered that if a man could not speak Egyptian he was not really a man. They saw language as the essence of what a man is. But now they would gladly forsake their language for the despised language of Canaan. It will be a complete reversal of their situation. They will turn from their culture and their gods so that they may serve the living God and talk His language. Indeed they will make their oaths to Him and become His people. It is a picture of their total submission to Yahweh.
‘One will be called ‘the city of destruction'.' The naming of this city presents the final picture of what will have happened. All that was Egypt (as seen by an Israelite) would be destroyed. Its pride, its arrogance, its mastery, its gods. And this will be symbolised in the renaming of the city. All that was displeasing to Yahweh will have been destroyed, and Egypt will be in submission to Him.