Mahabharata 1.3.18

1.3.18

tenaivamuktā bhrātarastasya tathā cakruḥ |
sa tathā bhrātṝnsaṃdiśya takṣaśilāṃ pratyabhipratasthe |
taṃ ca deśaṃ vaśe sthāpayāmāsa || 18 ||

"One day Janamejaya, the son of Parikshit, while a-hunting, observed in a particular part of his dominions a hermitage where dwelt a certain Rishi of fame, Srutasrava. He had a son named Somasrava deeply engaged in ascetic devotions. Being desirous of appointing that son of the Rishi as his Purohita, Janamejaya, the son of Parikshit, saluted the Rishi and addressed him, saying, 'O possessor of the six attributes, let this thy son be my purohita.' The Rishi thus addressed, answered Janamejaya, 'O Janamejaya, this my son, deep in ascetic devotions, accomplished in the study of the Vedas, and endued with the full force of my asceticism, is born of (the womb of) a she-snake that had drunk my vital fluid. He is able to absolve thee from all offences save those committed against Mahadeva. But he hath one particular habit, viz. he would grant to any Brahmana whatever might be begged of him. If thou canst put up with it, then thou take him.' Janamejaya thus addressed replied to the Rishi, 'It shall be even so.' And accepting him for his Purohita, he returned to his capital; and he then addressed his brothers saying, 'This is the person I have chosen for my spiritual master; whatsoever he may say must be complied with by you without examination.' And his brothers did as they were directed. And giving these directions to his brothers, the king marched towards Takshyashila and brought that country under his authority.