Buddhism

"If one is trying to practice meditation and it still eating meat, he would be like a man closing his ears and shouting loudly, and then asserting that he heard nothing ...Pure and earnest , when walking a narrow path, will never so much as tread on the growing grass beside the path. How can a bhikshu, who hopes to become a deliverer of others, himself be living on the flesh of other sentient beings? Pure and earnest bhikshus will never wear clothing made of silk, nor wear boots made of leather for it involves the taking of life. Neither will they indulge in eating milk or cheese because thereby they are depriving the young animals of that which is rightfully belongs to them."

Surangama Sutra