Rabbi Eliezer said: Why did the text say twice, "I said unto thee, In thy blood, live; yea, I said unto thee, In thy blood, live"? But the Holy One, blessed be He, said: By the merit of the blood of the covenant of circumcision and the blood of the Paschal lamb ye shall be redeemed from Egypt, and by the merit of the covenant of circumcision and by the merit of the covenant of the Passover in the future ye shall be redeemed at the end of the fourth kingdom; therefore it is said, "I said unto thee, In thy blood, live; yea, I said unto thee, In thy blood, live" (ibid.).