The Levites

The only group of Jews that escaped enslavement was the tribe of Levi. Levi was the last of Jacob's sons to die, and his influence over his tribe was great and lasting. They had taken over the Torah academy jacob had established in Goshen, and they instructed the children of Israel in the knowledge of G-d and His holy teachings.

Thus they were occupied with spiritual matters and did not mix with the Egyptians, while many of their brethren bad given up their old customs and way of life. Except for their language, clothing, and names, many of the children of Israel had become assimilated into the social and cultural environment of their Egyptian neighbors, and they were the ones to arouse the wrath of the Egyptians.

Only the children of Levi were, therefore, spared the slavery and oppression which the Egyptians imposed upon the rest of Israel.