Vishnu Purana 4.9.2

4.9.2

devāsurasaṃgrāmārambhe parasparavadhepsavo devāś cāsurāś ca brahmāṇam papracchuḥ ||

RAJI had five hundred sons, all of unequalled daring and vigour. Upon the occurrence of a war between the demons and the gods, both parties inquired of Brahmá which would be victorious. The deity replied, "That for which Raji shall take up arms." Accordingly the Daityas immediately repaired to Raji, to secure his alliance; which he promised them, if they would make him their Indra after defeating the gods. To this they answered and said, "We cannot profess one thing, and mean another; our Indra is Prahláda, and it is for him that we wage war." Having thus spoken, they departed; and the gods then came to him on the like errand. He proposed to them the said conditions, and they agreed that he should be their Indra. Raji therefore joined the heavenly host, and by his numerous and formidable weapons destroyed the army of their enemies.