Srimad-Bhagavatam: Canto 12 - Chapter 1 - Verse 18
Sanskrit:
अपश्यंस्तक्षकं तत्र राजा पारीक्षितो द्विजान् ।उवाच तक्षक: कस्मान्न दह्येतोरगाधम: ॥ १८ ॥
ITRANS:
apaśyaṁs takṣakaṁ tatrarājā pārīkṣito dvijānuvāca takṣakaḥ kasmānna dahyetoragādhamaḥ
Translation:
When King Janamejaya did not see Takṣaka entering his sacrificial fire, he said to the brāhmaṇas: Why is not Takṣaka, the lowest of all serpents, burning in this fire?