楞伽阿跋多羅寶經註解 4.268

4.268

佛告大慧：「善哉！善哉！諦聽！諦聽！善思念之，當為汝說。」大慧白佛言：「唯然受教。」佛告大慧：「有無量因緣不應食肉，然我今當為汝略說。謂一切眾生從本以來展轉因緣，常為六親，以親想故，不應食肉。」

The Buddha told Mahāmati: "Excellent! Excellent! Listen attentively! Listen attentively, and reflect on it well; I shall explain it for you." Mahāmati said to the Buddha: "So be it; I receive your instruction." The Buddha told Mahāmati: "There are immeasurable causes and conditions why one should not eat meat, yet I shall now briefly explain them for you. All sentient beings, through mutual causes and conditions from the beginningless past, have constantly been one's six kinds of kin; considering them as kin, one should not eat meat.