The Mahabharata/Book 1: Adi Parva…
“ Having eaten the thousands of Nishadas that live there, bring thou amrita. But let not thy heart be ever set on taking the life of a Brahmana. Of all creatures a Brahmana must not be slain. He is, indeed, like fire. A Brahmana, when angry, becomes like fire or the Sun, like poison or an edged weapon. A Brahmana, it has been said, is the master of all creatures. For these and other reasons, a Brahmana is the adored of the virtuous. O child, he is never to be slain by thee even in anger. ”
