R. Eliezer says: On it they were redeemed; but they are destined to be redeemed only on Tishrei, as it is written (Psalms 81:4) "Blow the shofar (of redemption) on the month (of Tishrei), (when the moon) is covered, on the day of our festival" (Rosh Hashanah). Why? (Ibid.) "for it is a statute for Israel, etc." And what is the intent of (Exodus , Ibid.) "It is this night for the L–rd"? It is this night on which the Holy One Blessed be He said to our father Abraham: "On this night I will redeem your children," and when the time arrived, the Holy One Blessed be He did not delay (to redeem them) even for an instant. "guarded for all the children of Israel": We are hereby taught that all of Israel are destined to be "guarded" upon it (in halachic observance of the Pesach (Passover).)