Matsya Purana — The Maheshvara Vow: Śiva-Caturdaśī Vrata
दीर्घायुरारोग्यकुलान्नवृद्धिर् अत्राक्षयामुत्र चतुर्भुजत्वम् गणाधिपत्यं दिवि कल्पकोटिशतान्युषित्वा पदमेति शम्भोः //
dīrghāyurārogyakulānnavṛddhir atrākṣayāmutra caturbhujatvam gaṇādhipatyaṃ divi kalpakoṭiśatānyuṣitvā padameti śambhoḥ //
Here (in this life) he gains long life, freedom from disease, and increase of family and sustenance (prosperity); here he becomes undecaying, and hereafter he attains a four-armed form. Having dwelt in heaven for hundreds of crores of kalpas as a lord of Śiva’s gaṇas, he finally reaches the supreme abode of Śambhu (Śiva).
It does not discuss pralaya directly; it teaches a karmic-afterlife sequence—worldly merit, heavenly enjoyment for vast periods, and ultimate attainment of Śambhu’s abode.
It frames righteous worship and dharmic conduct as producing tangible household aims—health, longevity, prosperity, and lineage growth—while also aiming beyond them toward higher spiritual attainment.
No specific Vāstu or temple-rule is stated; the verse functions as a ritual “phala-śruti,” promising defined spiritual rewards for Śiva-oriented worship/observance.