[146] And since I have explained this distinct and humane command respecting the oxen which tread out the corn, I will now proceed to speak of that one which relates to the animals which plough, which is also of the same family; for the lawgiver also forbids the husbandman to yoke the ox and the ass together in the same plough for ploughing, [50] considering in this not only the difference of nature between the two animals, because the one is clean, while the ass is one of the unclean beasts, and it is not becoming to bring together animals which are so utterly alienated, but also because they are unequal in point of strength, he takes care of that which is the weaker, in order that it may not be oppressed and worn out by the greater power of the other. And, indeed, the ass, which is the weaker animal, is driven outside of the sacred precincts; but the more vigorous beast, namely, the ox, is offered up as a victim in the most perfect sacrifices.