דברי הימים א, פרק ב׳, פסוק א׳

The genealogy of the nation naturally begins at its roots, outlining the sons of its founding patriarch. The family tree starts with Jacob, who is also known as Israel. His sons from his wife Leah, namely Reuben, Simeon, Levi, Judah, Issachar, and Zebulun, are presented precisely in the order they were born [ביאור שטיינזלץ].

While the historical record opens by acknowledging all the tribes, the attention quickly narrows to the lineage of Judah. This sudden shift highlights the primary purpose of the broader narrative, which is to document the history of the kings of Judah [רד״ק].