Mbh 13.116.2b

Indeed, the practice is not regarded as sinful. There is nothing, O delighter of the Kurus, that is equal in point of merit, either here or hereafter, to the practice of compassion to all living creatures. The man of compassion has no fear. Those harmless men that are endued with compassion have both this world and the next. Persons conversant with duty say that that Religion is worthy of being called Religion which has abstention from cruelty for its indication. The man of cleansed soul should do only such acts as have compassion for their soul. That flesh which is dedicated in sacrifices performed in honour of the deities and the Pitris is called Havi (and, as such, is worthy of being eaten). That man who is devoted to compassion and who behaves with compassion towards others, has no fear to entertain from any creature. It is heard that all creatures abstain from causing any fear unto such a creature. Whether he is wounded or fallen down or prostrated or weakened or bruised, in whatever state he may be, all creatures protect him. Indeed, they do so, under all circumstances, whether he is on even or uneven ground. Neither snakes nor wild animals, neither Pisachas nor Rakshasas, ever slay him. When circumstances of fear arise, he becomes freed from fear who frees others from situations of fear. There has never been, nor will there ever be, a gift that is superior to the gift of life. It is certain that there is nothing dearer to oneself than one's life. Death, O Bharata, is a calamity or evil unto all creatures. When the time comes for Death, a trembling of the whole frame is seen in all creatures. Enduring birth in the uterus, decrepitude and afflictions of diverse kinds, in this ocean of the world, living creatures may be seen to be continually going forward and coming back. Every creature is afflicted by death.