Philo Judaeus De Virtutibus 55

And the clearest proof of what I have said may be afforded by the following consideration. He had a friend and pupil, one who had been so almost from his very earliest youth, Joshua by name, whose friendship he had won, not by any of the arts which are commonly in use among other men, but by that heavenly and unmixed love from which all virtue is derived. This man lived under the same roof, and shared the same table with him, except when solitude was enjoined to him on occasions when he was inspired and instructed in divine oracles. He also performed other services for him in which he was distinguished from the multitude, being almost his lieutenant, and regulating in conjunction with him the matters relating to his supreme authority.