(Exodus 13:5) "which He swore to your forefathers": Where did He swear it to your forefathers? Abraham — (Genesis 15:18) "On that day the L–rd made a covenant with Abraham." Isaac — (Ibid. 26:3) "Live in this land." Jacob — (Ibid. 28:13) "the land on which you are lying, etc."... "Then you shall perform this service": As the service that you performed in Egypt so shall you perform in all the generations. These are the words of R. Nathan.