Why Do We Celebrate This Meal?
On the last day of Passover, we read verses from the book of Isaiah as the haftorah. This reading includes many wondrous prophecies about the era of Moshiach.
The prophecy foretells of a leader upon whom "the spirit of the L‑rd shall rest, a spirit of wisdom and understanding, a spirit of counsel and heroism, a spirit of knowledge and fear of the L‑rd."
In addition to bringing peace to mankind ("he will judge the poor justly, and he shall chastise with equity the humble of the earth"), the new peace and G‑dly understanding will extend to all of G‑d’s creatures: “And a wolf shall live with a lamb, and a leopard shall lie with a kid . . . and a small child shall lead them.”
The Baal Shem Tov, the founder of the chassidic movement, was the first one to celebrate this meal, with an open door, allowing anyone who wished to partake.
The sixth Lubavitcher Rebbe explained that on the last day of Passover the radiance of Moshiach is already shining.