(Ibid. 12:27) "Then you shall say that it is a Paschal sacrifice to the L–rd.": R. Yossi Haglili said: The Jews would have deserved to die in Egypt (if not for the merit of the Paschal sacrifice) whereby the last of them consummated his sacrifice (and lived.) "Then you shall say that it is a Paschal sacrifice." We are hereby apprised that all who hear of or see the miracles that the Holy One Blessed be He wrought in Egypt must give praise. And thus is it written (Exodus 18:8-9) "And Moses related to his father-in-law all that the L–rd did to Pharaoh and to Egypt. And Yithro rejoiced, etc."