It is said that Rabbi (the Holy) teaches that it is illegal for an
unlearned man to eat animal food, for it is said (Lev. xi. 46), "This is
the law of the beast and the fowl;" therefore he who studies the law may
eat animal food, but he who does not study the law may not. Rabbi
Eliezar said, "It is lawful to split open the nostrils of an unlearned
man, even on the Day of Atonement which happens to fall on a Sabbath."
To which his disciples responded, "Rabbi, say rather to slaughter him."
He replied, "Nay, that would require the repetition of the usual
benediction; but in tearing open his nostrils no benedictory formula is
needed." Rabbi Eliezar has also said, "It is unlawful to travel with
such a one, for it is said (Deut. xxx. 30), 'For it is thy life and the
length of thy days.' The unlearned does not ensure his own life (since
he has no desire to study the law, which would prolong life), how much
less then will he regard the life of his neighbor?" Rabbi Samuel, son of
Nachman, says on behalf of Rabbi Yochanan, that it is lawful to split
open an unlearned man like a fish. "Aye," adds Rabbi Samuel, "and that
from his back."
THE TALMUD, _P'sachim_, fol. 49, col. 2.