Anushasana Parva 9.14

The ape said In my former life I used to eat the fruits belonging to Brahmanas. Hence have I become an ape. Hence it is clear that one endued with intelligence and learning should never take what belongs to Brahmanas. As one should abstain from this, one should avoid also all quarrels with Brahmanas. Having promised, one should certainly make the promised gift lo them.