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In the tapestry of Jewish thought, the concepts of "eternity" and "truth" are often viewed as abstract ideals. However, through the lens of Parshas Yisro and the historical narrative of King David, we discover that eternity is a legal and ontological structure built upon the foundation of the Oral Tradition (Mesorah).
1. The Philological Anchor: The Mystery of the "Full" L’olam
The discourse begins with a linguistic anomaly noted by the Baal HaTurim. In the Hebrew Bible, the word L’olam (forever/eternity) is almost always written in a "deficient" form (missing the letter vav). There are, however, two notable exceptions where the word is written "full" (malei), with the vav:
Regarding Moshe Rabbeinu: "And they will also believe in you forever" (Exodus 19:9).
Regarding Ammon and Moab: "You shall not seek their peace or their welfare... forever" (Deuteronomy 23:7).
At first glance, these two verses appear diametrically opposed. One establishes the eternal veracity of Moshe’s prophecy and the Torah; the other establishes an eternal exclusion of the nations of Ammon and Moab from the Jewish congregation. Yet, as the Zos L’Yaakov elucidates, the legitimacy of the House of David sits precisely at the intersection of these two "eternities."
2. The Crisis of Legitimacy: David and the Moabite Ban
The central drama of King David’s life was not merely his battles with Goliath or the Philistines, but a legal battle regarding his very identity. As a descendant of Ruth the Moabite, David’s right to enter the "Congregation of God" was fiercely contested.
The Talmud (Yevamos 76b) describes the scene where Doeg HaEdomi, a master of the Written Law, challenged David’s fitness for kingship. He argued that if Moabites are eternally banned, David is a product of an illicit union. This was not a minor genealogical quibble; it was an existential threat to the concept of Malkhus Beis David (the Davidic Monarchy).
3. The Sword of the Oral Law: Halacha L’Moshe MiSinai
The resolution to this crisis came from Avner ben Ner and was finalized by Amasa ben Yether. They relied on a tradition that clarified the written ban: "An Ammonite man is forbidden, but not an Ammonite woman; a Moabite man is forbidden, but not a Moabite woman."
This distinction—crucial for the survival of David's line—cannot be derived through human logic alone. It is a Halacha L’Moshe MiSinai, a law given directly to Moshe at Sinai that exists outside the parameters of hermeneutic debate.
Amasa ben Yether famously "girded his sword like an Ishmaelite" and declared that anyone who challenged this oral tradition deserved death. This act was not mere bravado; it was a defense of the integrity of the Mesorah. If the Oral Law could be undermined by the literalist logic of a Doeg HaEdomi, then the eternity of the Torah itself was at risk.
4. The Synthesis: Why the Covenants are One
The "full" L’olam connects these two points to teach us a singular truth: The eternity of the Davidic Monarchy is entirely dependent on the eternity of the Oral Torah.
If the Torah’s eternity (L’olam by Moshe) were only literal/written, David would be excluded.
By linking Moshe’s eternity to the "forever" of the Ammonite/Moabite ban, the Torah signals that David’s legitimacy is protected by the same eternal seal that protects Moshe’s prophecy.
So the House of David is not an external addition to the Jewish people, but an outgrowth of the Torah’s own internal logic. The Davidic covenant is "ordered in all things and secure" (Arucha va-kol u-shmura) because it is anchored in the absolute, unchangeable tradition passed from Moshe to the Elders.
Conclusion
Ultimately, the "Full L’olam" represents a reality that is complete and lacking nothing. Just as the Torah of Moshe is an eternal guide that can never be substituted or altered, the Kingship of David is an eternal institution that can never be revoked. The two are one: the Monarchy is the political expression of the Torah’s eternal truth, and the Oral Law is the legal bridge that allows that Kingship to exist. Through this connection, we find the strength of our faith—anchored in a tradition that survived the logic of its detractors and remains the "eternity of Israel."
