What is the…
“language of Canaan” in Isaiah 19:18

This is mentioned in Isaiah 19:18 and refers to the language spoken by the Jews living in Canaan.

In that day five cities in the land of Egypt will be speaking the language of Canaan and swearing allegiance to the Lord of hosts; one will be called the City of Destruction. —Isaiah 19:18 NASB

The language of the Canaanites and of the Hebrews was substantially the same. This is seen from the fragments of the Phoenician language which still survive, which show the closest analogy to the Hebrew. Yet the subject of the language of the “Canaanites” is very obscure.

The cuneiform writing of Babylon, as well as the Babylonian language, was taught in the Canaanite schools, and the clay tablets of Babylonian literature were stored in the Canaanite libraries.

Even the Babylonian divinities were borrowed by the Canaanites.

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