Mahabharata 1.46.8

1.46.8

śaśāpātha sa tacchrutvā pitaraṃ te ruṣānvitaḥ |
ṛṣeḥ putro mahātejā bālo'pi sthavirairvaraḥ || 8 ||

"Such was the Rishi insulted by thy father. The son, however, of that Rishi, in wrath, cursed thy father. Though young in years, the powerful one was old in ascetic splendour. Speedily touching water, he spake, burning as it were with spiritual energy and rage, these words in allusion to thy father, 'Behold the power of my asceticism! Directed by my words, the snake Takshaka of powerful energy and virulent poison, shall, within seven nights hence, burn, with his poison the wretch that hath placed the dead snake upon my un-offending father.' And having said this, he went to where his father was. And seeing his father he told him of his curse. The tiger among Rishis thereupon sent to thy father a disciple of his, named Gaurmukha, of amiable manners and possessed of every virtue. And having rested a while (after arrival at court) he told the king everything, saying in the words of his master, 'Thou hast been cursed, O king, by my son. Takshaka shall burn thee with his poison! Therefore, O king, be careful.' O Janamejaya, hearing those terrible words, thy father took every precaution against the powerful snake Takshaka.