Skandapurana 5.259.7

5.259.7

mantrairvinā ṣoḍaśa sopacāraiḥ kāryā supūjā narakādihaṃtuḥ ..
yathā tathā vai girijāpateśca kāryā mahā śūdra mahāghahaṃtrī .. 7 ..

Without mantras, an excellent worship of the slayer of hell and other [evils] should be performed with the sixteen offerings; / and in like manner [worship] of the lord of the mountain's daughter should be performed, O noble Śūdra, which destroys great sins."