Sirach 45:24-26

New Revised Standard Version, Anglicised

²⁴ Therefore a covenant of friendship was established with him,
    that he should be leader of the sanctuary and of his people,
that he and his descendants should have
    the dignity of the priesthood for ever.
²⁵ Just as a covenant was established with David
    son of Jesse of the tribe of Judah,
that the king’s heritage passes only from son to son,
    so the heritage of Aaron is for his descendants alone.