"Thus, Mahāmati, wherever there is the evolution of living beings, let people cherish the thought of kinship with them, and, thinking that all beings are [to be loved as if they were] an only child, let them refrain from eating meat. So with Bodhisattvas whose nature is compassion, [the eating of] meat is to be avoided by him. Even in exceptional cases, it is not [compassionate] of a Bodhisattva of good standing to eat meat."
January 1, 1970
https://en.wikiquote.org/wiki/Buddhist_vegetarianism