Philo Judaeus De Sacrificiis Abelis Et Caini 43

And he learnt all these things from Abraham his grandfather, who was the author of his own education, who gave to the all-wise Isaac all that he had, ¹ leaving none of his substance to bastards, or to the spurious reasonings of concubines, but he gives them small gifts, as being inconsiderable persons. For the possessions of which he is possessed, namely, the perfect virtues, belong only to the perfect and legitimate son; but those which are of an intermediate character, are suitable to and fall to the share of those who are not perfect, but who ^{2 3 4} have advanced as far as the encyclical branches of elementary education, of which Agar and Cheturah partake, Agar meaning "a dwelling near," and Cheturah meaning "sacrificing."