Philo Judaeus De Posteritate Caini 96

But a thing which is sacred is proved to be so by three witnesses, the middle number, education, and perfect number. On which account it is said, "Of everything which cometh in the number under the rod, the tenth is sacred," for that which is not accounted worthy of being comprehended under number is profane, not sacred; but that which is according to number is approved, as having been already tested. Accordingly the law says, that the corn which was collected in Egypt by Joseph could not be counted," ¹ and adds, "for it was without number," since the things which nourish the body and the Egyptian passions, are utterly unworthy to be included in any calculation. ^{2 3}