אמור // לא תשחטו ביום אחד

The commandment concerning the killing of animals is necessary, because the natural food of man consists of vegetables and of the flesh of animals: the best meat is that of animals permitted to be used as food. No doctor has any doubts about this. Since, therefore, the desire of procuring good food necessitates the slaying of animals, the Law enjoins that the death of the animal should be the easiest. It is not allowed to torment the animal by cutting the throat in a clumsy manner, by poleaxing, or by cutting off a limb whilst the animal is alive. It is also prohibited to kill an animal with its young on the same day (Lev. 22:28), in order that people should be restrained and prevented from killing the two together in such a manner that the young is slain in the sight of the mother; for the pain of the animals under such circumstances is very great. There is no difference in this case between the pain of man and the pain of other living beings, since the love and tenderness of the mother for her young ones is not produced by reasoning, but by imagination, and this faculty exists not only in man but in most living beings. This law applies only to ox and lamb, because of the domestic animals used as food these alone are permitted to us, and in these cases the mother recognises her young. The same reason applies to the law which enjoins that we should let the mother fly away when we take the young. The eggs over which the bird sits, and the young that are in need of their mother, are generally unfit for food, and when the mother is sent away she does not see the taking of her young ones, and does not feel any pain. In most cases, however, this commandment will cause man to leave the whole nest untouched, because [the young or the eggs], which he is allowed to take, are, as a rule, unfit for food. If the Law provides that such grief should not be caused to cattle or birds, how much more careful must we be that we should not cause grief to our fellowmen.

IF A BIRD’S NEST CHANCE TO BE BEFORE THEE. This also is an explanatory commandment, of the prohibition ye shall not kill it [the dam] and its young both in one day, because the reason for both [commandments] is that we should not have a cruel heart and be discompassionate [...] It was not a matter of G-d’s mercy extending to the bird’s nest or the dam and its young, since His mercies did not extend so far into animal life as to prevent us from accomplishing our needs with them, for, if so, He would have forbidden slaughter altogether. But the reason for the prohibition [against taking the dam with its nest, or against killing the dam with its young in one day] is to teach us the trait of compassion and that we should not be cruel, for cruelty proliferates in man’s soul as it is known that butchers, those who slaughter large oxen and asses are men of blood; they that slaughter men, are extremely cruel. It is on account of this [cruelty] that the Rabbis have said: “The most seemly among butchers is a partner of Amalek.” Thus these commandments with respect to cattle and fowl are not [a result of] compassion upon them, but they are decrees upon us to guide us and to teach us traits of good character. So, too, the Rabbis refer to all commandments of the Torah — positive and negative — as “decrees.”

. . . [Moses] said further before him, ‘Master of the world you wrote in your Torah (Leviticus 22:28) ”However, no animal from the herd or from the flock shall be slaughtered on the same day with its young.” Have they not already killed so many sons with their mothers, and you are silent?!’