Some degenerated folks suggest to be worthy of gift, holly, by telling that they vow to ever return to liberate all being.
That's as low as the underlying nature of all beings. Beings are bond to come back harm themself, eat others, for this foolish desires, out of compassion, a Bodhisattva (one seeking for awakening) would never do, as such a person sees, suffering, sees the circle of debt.
May those not blind know people, who argue for there incapacity of abounding their selfish desires by "I nourish and take on your sacrifices to liberate you", know as not only the greatest thieves in this world if they even wear robes, but also very worldly thieves, neither anyhow related to the Buddhas and Noble ones, nor even heading toward the Gems and the path, as long as not abound such defiled or even deliberately cheatings for a living, the belly, trade, gain and fame.
Out of this, having such as reason, Noble Ones reject not only human flesh (as some wouldn't dear to sacrifices themself for those heading toward liberation) but also what's harmful gained for their sake.
Long, indeed, are those bond to ever come back, who speak untrue in regard of the sages and their Dhamma, their conducts and practice, as well as destiny.