The Religion and Philosophy of the Veda and Upanishads v1.c16.s3.5

v1.c16.s3.5

he smites away the darkness and triumphs over the powers of darkness and witches; he prolongs the lives of men and drives away sickness, disease, and evil dreams. He is also the divine priest of the gods, and is entreated on his rising to declare men sinless before Mitra and Varuṇa. When invoked with Indra he becomes a slayer of Vṛtra. But another myth tells that Indra defeated him and stole his wheel, a fairly obvious allusion to the obscuration of the sun by the thunderstorm.