Vishnupurana 4.4.16

4.4.16

tataś codyatāyudhā durātmāyam asmadapakārī yajñavighātakartā hayahartā hanyatāṃ hanyatām ity avocan |
tatas tenāpi bhagavatā kiṃcidīṣatparivartitalocanenāvalokitāḥ svaśarīrasamutthenāgninā dahyamānā vineśuḥ ||

At that period Sagara commenced the performance of the solemn sacrifice of a horse, who was guarded by his own sons: nevertheless some one stole the animal, and carried it off into a chasm in the earth, Sagara commanded his sons to search for the steed; and they, tracing him by the impressions of his hoofs, followed his course with perseverance, until coming to the chasm where he had entered, they proceeded to enlarge it, and dug downwards each for a league. Coming to Pátála, they beheld the horse wandering freely about, and at no great distance from him they saw the Rishi Kapila sitting, with his head declined in meditation, and illuminating the surrounding space with radiance as bright as the splendours of the autumnal sun, shining in an unclouded sky. Exclaiming, "This is the villain who has maliciously interrupted our sacrifice, and stolen the horse! kill him! kill him!" they ran towards him with uplifted weapons. The Muni slowly raised his eyes, and for an instant looked upon them, and they were reduced to ashes by the sacred flame that darted from his person.