When Esau and Jacob successfully established the foundation of faith and the foundation of substance, the foundation to receive the Messiah, long sought since Adam's time, was laid for the first time. However, because Abraham had already failed in his first offering, his descendants still had to go through the indemnity of 400 years of slavery. Therefore, God internally expanded His providence to the national level upon the base of the family foundation for the Messiah established by Isaac's family. Externally, however, Isaac's descendants still had to undergo the 400 years of slavery as indemnity for Abraham's failure in the first offering.