Behold, the days come, saith Jehovah, when I will raise unto David a righteous Branch, who shall reign as king, and act wisely, and shall execute judgment and righteousness in the land.

(And thou, Bethlehem Ephratah, little to be among the thousands of Judah, out of thee shall he come forth unto me who is to be Ruler in Israel: whose goings forth are from of old, from the days of eternity.)

And thou Bethlehem, land of Juda, art in no wise the least among the governors of Juda; for out of thee shall go forth a leader who shall shepherd my people Israel.

For it is clear that our Lord has sprung out of Juda, as to which tribe Moses spake nothing as to priests.

Birthright was

The blessings of thy father surpass the blessings of my ancestors, Unto the bounds of the everlasting hills: They shall be on the head of Joseph, And on the crown of the head of him that was separated from his brethren.

Because whom he has foreknown, he has also predestinated to be conformed to the image of his Son, so that he should be the firstborn among many brethren.

General references

Of the sons of Judah: their generations, after their families, according to their fathers' houses, by the number of the names, from twenty years old and upward, all that went forth to military service:

These are the families of Judah according to those that were numbered of them, seventy-six thousand five hundred.

then it shall be, in the day that he maketh his sons to inherit what he hath, that he may not make the son of the beloved firstborn before the son of the hated, who is the firstborn;