"What is "Chad Gadya, Chad Gadya that Father Bought for Two Zuzim"? asked Rav Ofer Erez shlit"a in his lesson and answers - "Father is Yaakov Avinu who bought only one kid, which is Mashiach ben David".

Rav Ofer mentioned at the beginning of the lesson the teaching of Heichal HaBeracha by the Admor of Komarna, which says that truly King David was supposed to be born from Esav and Leah (if Esav had done teshuvah (repentance)), and Yosef HaTzaddik would have been born from Yaakov and Rachel. However, after Yaakov bought the birthright from Esav, King David also became his descendant. Rav Ofer continues in this way to explain the secret of Chad Gadya in the Pesach Haggadah.

Why is Chad Gadya written twice in the Pesach Haggadah hymn?

"Chad Gadya is written again because one kid Yaakov bought from Esav (the purchase of King David's neshamah (soul), according to the above) and one kid he had on his own. From here, twice, Chad Gadya, Chad Gadya" refers to Mashiach ben David and Mashiach ben Yosef, which Yaakov Avinu, through the act of buying the birthright and marrying Leah, essentially acquired the entire process of the kid goats, the neshamah of Mashiach ben David."

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"And the Cat Came and Ate the Kid" - The Attempt Not to Oppose the Tzaddik

""And the cat came and ate the kid." The Gaon of Vilna says according to the Mishnah, that the trait of the cat (shunra) is jealousy. The Chad Gadya is the secret of the true tzaddik, the secret of the Mashiachs, and there is always a trial among the souls of Israel, especially among the greats of Israel, to be jealous of this tzaddik who is in the aspect of Mashiach, which is a very great trial. The Gaon learns this from Tikkunei Zohar 70, where it is written that from Yosef's dreams we learn that Yosef ruled over the upper and lower worlds. The sun and the moon hint at the upper spiritual worlds, the sheaves in the dream hint at our world, where everyone nullifies themselves and receives abundance from the neshamah of Yosef HaTzaddik."

From the Angels' Jealousy, It Descends That the Greats of Israel Will Be Jealous of the Tzaddik

"The holy Zohar adds and writes that the angels are jealous of this neshamah from which everyone receives, and from the angels' jealousy, it descends that the people of Israel and even the greats of Israel will be jealous of this tzaddik. Therefore, we have such a great trial to nullify ourselves to this tzaddik, not to be jealous of him and not to oppose him. The Gra writes that this is the secret interpretation of "And the cat came and ate the kid," because the kid is the secret of the souls in the aspect of Mashiach, and the cat that eats it is the jealousy that conceals the light of the tzaddik in the world."

The Trial of the People of Israel Is Not to Oppose and Be Jealous of This Tzaddik

"R' Natan writes these things, although he does not connect it to the interpretation of 'Chad Gadya,' but he explains that the trial of the people of Israel is not to oppose and be jealous of this tzaddik." Two tzaddikim are written about with jealousy: 1. About Yosef it is said, "And his brothers envied him" (Genesis 37:11), how can it be that all the tribes, who are holy of holies, the roots of the souls of Israel, are jealous of Yosef HaTzaddik, the foundation of the world?! How can it be that they want to kill him and in the end throw him into a pit and sell him as a slave? But this is the descent of the angels' jealousy! "And the cat came and ate the kid," the light of the tzaddik was hidden and as a result, we descended into exile in Egypt."

Shaul Knew David Was the Complete Tzaddik and Yet Was Jealous of Him

"2. "And Shaul eyed David from that day and onward" (1 Samuel 18:9), about Shaul's jealousy of David, it is said that it came from the greatness of King David, that Shaul recognized in David that he was the complete tzaddik. King Shaul was a tzaddik, the foundation of the world, as pure as the day he was born, he had only one mistake, not killing Agag, king of Amalek. And we see that even in such a great tzaddik, jealousy exists, because it is a fundamental principle embedded in creation - the jealousy that conceals and hides the light of the true tzaddik."

"How much must one pray to be saved from this jealousy that is hidden in the human soul, if one does not clarify it, entire doctrines arise against the tzaddik."