Skanda Purana 7.20.218

7.20.218

kumāreṇa saha varāhasya yuddham . kumāraśaktiprahārato varāhasya dehāvapātaḥ . varāhaśarīrādunmuktena viṣṇunā kṛtā śaṃkarastutiḥ. pāśupatavratopadeśārthaṃ prārthanā ca . devatābhyo vratopadeśārthaṃ śambhordevaiḥ saha dyulokagamanam .

The battle of the Boar with Kumāra. By a strike of Kumāra's lance, the Boar's body collapses. Released from the body of the Boar, Viṣṇu offers praise to Śaṃkara. And his prayer for instruction in the Pāśupata observance. To instruct the deities in the observance, Śambhu goes to heaven along with the gods.