In his Thought-Free Meditation, Vimalamitra says:

At all times, yogis should avoid eating meat and fish. They should eat in proper measure and partake of food that is in harmony with the teachings.

Gyalse Thogme also says:

When beings die a natural death
Who have, from time without beginning, been our close-loved kin,
We weep. This shows indeed how wrong it is
To eat the flesh of beasts that have been killed for meat.

(Source: FB, p. 72)

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