Parshat Lekh Lekha - Berit Bein HaBetarim: The Covenant between the Parts, shiur written by Harav Yaakov Medan

While the Covenant between the Parts is mostly remembered for God's promise that Avraham's descendants will become a great nation, it also promises that they will endure slavery and suffering in Egypt. What is behind Chazal's varied approaches to the reason Avraham deserved such a harsh punishment?