Now, these souls were reincarnated in Egypt. The 130 years of Jewish subjugation in Egypt correspond to the 130 years that Adam was separated from Eve. Their hard labor was to purify them.
Joseph moved these people from city to city. The trouble of moving to another city also served to purify them.
They are called "people of Israel" and not "sons of Israel." They lived in communities in their towns, and they behaved like Jews. Jacob, too, taught and accepted converts when he came to Egypt. All these lived as Jews.
It was for these souls that Jews had to go down to Egypt to bring them back. They constituted the mixed multitude who went out of Egypt together with the Jews.
Art: Adam and Eve by Hans Holbein