Philo Judaeus De Virtutibus 95

The laws command ¹ that the people should offer to the priests first fruits of corn, and wine, and oil, and of their domestic flocks, and of wools. But that of the crops which are produced in the fields, and of the fruits of the trees, they should bring in full baskets in proportion to the extent of their lands; with hymns made in praise of God, which the sacred ² volumes preserve recorded in writing. And, moreover, they were not to reckon the first-born of the oxen, and sheep, and goats in their herds and flocks as if they were their own, but were to look upon these also as first-fruits, in order that, being thus trained partly to honour God, and partly also not to seek for every possible gain, they might be adorned with those chief virtues, piety and humanity.