Garudapurana 1.223.18

1.223.18

tṛtīyaṃ skāndamuddiṣṭaṃ kumāreṇa tu bhāṣitam /
caturthaṃ śivadharmākhyaṃ syānnandīśvarabhāṣitam //

the third is declared to be the Skānda, spoken by Kumāra, / and the fourth is known as the Śivadharma, spoken by Nandīśvara;