Mahabharata 6.86.68

6.86.68

chādyamānastu nāgaiḥ sa dhyātvā rākṣasapuṃgavaḥ |
sauparṇaṃ rūpamāsthāya bhakṣayāmāsa pannagān || 68 ||

In the sight of all the combatants there present, beholding that illusion of the wicked Rakshasa in the van of battle, Iravat became inflamed with rage and adopted steps for himself having recourse to illusion. And when that hero, never retreating from battle, became inflamed with wrath, a Naga related to him by his mother's side, came to him. Surrounded on all sides, in that battle by Nagas, that Naga, O king, assumed a huge form mighty as Ananta himself. With diverse kinds of Nagas then he covered the Rakshasa. While being covered by those Nagas, that bull among Rakshasas reflected for a moment, and assuming the form of Garuda, he devoured those snakes. When that Naga of his mother's line was devoured through illusion, Iravat became confounded. And while in that state, the Rakshasa slew him with his sword, Alamvusha felled on the earth Iravat's head decked with ear-rings and graced with a diadem and looking beautiful like a lotus or the moon.