Mahabharata 1.48.16

1.48.16

tamindraḥ prāha suprīto na tavāstīha takṣaka |
bhayaṃ nāgendra tasmādvai sarpasatrātkathaṃcana || 16 ||

'Meanwhile, Takshaka, that prince of snakes, as soon as he heard that king Janamejaya was engaged in the sacrifice, went to the palace of Purandara (Indra). And that best of snakes, having represented all that had taken place, sought in terror the protection of Indra after having acknowledged his fault. And Indra, gratified, told him, 'O prince of snakes, O Takshaka, here thou hast no fear from that snake-sacrifice. The Grandsire was pacified by me for thy sake. Therefore, thou hast no fear. Let this fear of thy heart be allayed.'