Thirukkural

உண்ணாமை உள்ளது உயிர்நிலை ஊனுண்ண அண்ணாத்தல் செய்யாது அளறு.

Unnaamai Ulladhu Uyirnilai Oonunna Annaaththal Seyyaadhu Alaru

Not to eat flesh contributes to the continuance of life; therefore if a man eat flesh, hell will not open its mouth (to let him escape out, after he has once fallen in)