Matsya Purana — Catalogue of the Eighteen Puranas
यत्र माहेश्वरान्धर्मान् अधिकृत्य च षण्मुखः कल्पे तत्पुरुषं वृत्तं चरितैरुपबृंहितम् //
yatra māheśvarāndharmān adhikṛtya ca ṣaṇmukhaḥ kalpe tatpuruṣaṃ vṛttaṃ caritairupabṛṃhitam //
There, taking up the sacred observances of Maheśvara (Śiva) as his theme, Ṣaṇmukha (Skanda) in that kalpa expounded the account of Tatpuruṣa, enriching it with (illustrative) deeds and episodes.
It does not directly describe pralaya; it situates a teaching within a specific kalpa, implying the Purana’s method of anchoring doctrines in cosmic time-cycles.
By foregrounding “Māheśvara dharmas,” it signals that proper conduct and observances (vratas, worship, discipline) are authoritative sources for dharmic living applicable to rulers and householders alike.
The verse points to Śaiva ritual-dharma as the doctrinal frame; in Matsya Purana this often undergirds temple/installation practice, where correct Śaiva observance legitimizes icon, shrine, and consecration procedures.