Philo Judaeus De Virtutibus 53

[53] For when the appointed limit of human existence was on the point of being reached by him, and when by distinct intimation from God he became aware that he was about to depart from the world, he did not act like any other person, whether king or private individual, whose only anxiety and prayer is to leave their inheritance to their children; but although he had become the father of two sons, he was not so much under the influence of the natural affection and love for his offspring which he undoubtedly felt as to bequeath his authority to either of them. And yet, even he had some suspicion of the worth of his children; at all events, he had no lack of virtuous and pious nephews, who were, indeed, already invested with the high priesthood, as a reward of their virtue.