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To sufficiently comprehend the evolution of the enslavement of B’nai Yisrael in Mitzriyim, it would seem that one needs to comprehend the closed nature of the two preceding Parshiyot; the concluding posuk of Vayigash;
“And Yisrael dwelt in the land of Mitzriyim in the land of Goshen, and they acquired property in it and… multiplied greatly.”
and the first posuk of Vayechi;
And Yaakov lived in the land of Mitzrayim for seventeen years…
We need to understand the gist of the Kli Yekar; that the Sh’vatim, the Am, knowing that they were to be in Mitzriyim for a definite period of time beyond their lifetimes thus perceived a permanence. Therefore, they adapted themselves to living in Mitzriyim long-term and were thus vulnerable to Mitzri “encouragement” to melt, to assimilate into Mitzri society, to work for the nation, etc. The B’nai Yisrael accumulated land, assets, wealth. With the passage of time and with Yaakov and the brothers — the tribal heads all passing from the scene, the Am forgot about their true home in Canaan, in Eretz Yisrael, and became complacent in Mitzriyim. And with the passing of heads of B’nai Yisrael, the Am no longer retained an elevated status in the eyes of the Mitzriyim who quickly forgot how Yosef saved them from famine.