Skanda Purana 6.2.85.36

6.2.85.36

35 athendreśvaraliṅgamāhātmyavarṇanam, tatra brahmaputrasya kuśadhvajasya svargataḥ pātanātkruddhena brahmaṇā svajaṭāmutpāṭya bhūmau pātanādvṛtrāsurotpattistato vṛtrāsurendrayoryuddha indrasya parābhavaḥ, vṛtraṃ jetuṃ bṛhaspaterājñayā śakrasya mahākālavane gamanam, tapaḥprabhāvena vṛtrāsuraṃ hatvā taddhatyādoṣanivṛttaye tatra liṃgasthāpanam, indreśvaramāhātmyavarṇanam 111 1

35. Now begins the description of the māhātmya of the Indreśvara liṅga: There, because Kuśadhvaja, the son of Brahmā, was cast down from heaven, Brahmā, enraged, tore out his own matted hair and cast it on the ground, whence arose Vṛtrāsura; then in a battle between Vṛtrāsura and Indra, Indra was defeated; Śakra's departure to the Mahākālavana by the command of Bṛhaspati to conquer Vṛtra; having slain Vṛtrāsura by the power of austerity, the installation of a liṅga there for the removal of the sin of slaying him; the description of the Indreśvara māhātmya. 111.1