The Surangama Sutra: The Four Clear and Unalterable Instructions on Purity - Refrain from Lust and Killing, Part 6 of 6, Dec. 22, 2018

Still, He’s telling them, “Don’t eat meat, don’t wear silk even, don’t wear leather boots, don’t wear down from the plucked feathers from the birds, don’t wear down from this country. Don’t consume milk, don’t consume cream made from milk, and butter, then you can truly transcend this world.” Not just I said it, the Buddha said it here. I marked it with a star. “Why? It is because when one wears something taken from a living creature, one creates conditions with it, just as when people eat the hundred grains, their feet cannot leave the earth.”