Mbh 12.111.2a

"'Bhishma said, "In this connection is recited the old story of the discourse between a tiger and a jackal. Listen to it, O Yudhishthira! In ancient times, in a city called Purika, full of affluence, there was a king named Paurika. That worst of beings was exceedingly cruel and took delight in injuring others. On the expiry of the period of his life he obtained an undesirable end. In fact, stained by the evil acts of his human life, he was reborn as a jackal. Remembering his former prosperity, he became filled with grief and abstained from meat even when brought before him by others. And he became compassionate unto all creatures, and truthful in speech, and firm in the observance of austere vows. At the appointed time he took food which consisted of fruit that had dropped from the trees. That jackal dwelt in a vast crematorium and liked to dwell there. And as it was his birth place, he never wished to change it for a finer locality. Unable to endure the purity of his behaviour, the other members of his species, endeavoured to make him alter his resolve by addressing him in the following words fraught with humility: 'Though residing in this terrible crematorium, thou desirest yet to live in such purity of behaviour. Is not this a perversity of understanding on thy part, since thou art by nature an eater of carrion? Be thou our like. All of us will give thee food. Eat that which ought always to be thy food, abandoning such purity of conduct.' Hearing these words of theirs, the jackal replied unto them, with rapt attention, in these sweet words fraught with reason and inculcating harmlessness to all: 'My birth has been low. It is conduct, however, that determines the race.[341] I desire to behave in such a way that my fame may spread. Although my habitation is this crematorium, yet listen to my vows in respect of behaviour. One's own self is the cause of one's acts. The mode of life to which one may betake oneself is not the cause of one's religious acts.