Srimad-Bhagavatam: Canto 12 - Chapter 1 - Verse 19
Sanskrit:
तं गोपायति राजेन्द्र शक्र: शरणमागतम् ।तेन संस्तम्भित: सर्पस्तस्मान्नाग्नौ पतत्यसौ ॥ १९ ॥
ITRANS:
taṁ gopāyati rājendraśakraḥ śaraṇam āgatamtena saṁstambhitaḥ sarpastasmān nāgnau pataty asau
Translation:
The brāhmaṇas replied: O best of kings, the snake Takṣaka has not fallen into the fire because he is being protected by Indra, whom he has approached for shelter. Indra is holding him back from the fire.