Skandapurana 1.1.14.3

1.1.14.3

2 atha brahmaviṣṇubhyāṃ vahnistambhamayasya bhagavataḥ stavanam, tato vahnistambhamayaparameśvareṇa
brahmaviṣṇvorvarapradānama, vrahmaviṣṇvoḥ prārthanayā vahnistambhamayena parameśvareṇa nijarūpamupasaṃhṛtyāruṇācalarūpeṇa sthāvaraliṃgatādhāraṇama, sthāvaraliṃgamāhātmyavarṇanam 25

2. Next, the praise of the Lord in the form of a pillar of fire by Brahmā and Viṣṇu; then, the granting of boons to Brahmā and Viṣṇu by the Supreme Lord in the form of a pillar of fire; at the request of Brahmā and Viṣṇu, the Supreme Lord who was in the form of a pillar of fire withdraws his own form and assumes the state of an immovable liṅga in the form of Aruṇācala; description of the glory of the immovable liṅga. 25