Philo Judaeus De Virtutibus 66

This, now, is the first and most conspicuous proof of his great humanity and good faith towards and affection for all those of his own people, and there is also another which is not inferior to that which I have already mentioned. For when Joshua, being his most excellent pupil and the imitator of his amiable and excellent disposition, had been approved of as the ruler of the people by the judgment of God, Moses was in no respect downcast as some other men might have been at the fact of its not having been his own sons or nephews who were appointed;