Matsya Purana — The Ravi-Śayana
उमापते रवेर्वापि न भेदो दृश्यते क्वचित् यस्मात्तस्मान्मुनिश्रेष्ठ गृहे शम्भुं समर्चयेत् //
umāpate ravervāpi na bhedo dṛśyate kvacit yasmāttasmānmuniśreṣṭha gṛhe śambhuṃ samarcayet //
O best of sages, no distinction is ever perceived between Umāpati (Śiva) and Ravi (the Sun). Therefore, for that reason, one should duly worship Śambhu (Śiva) within one’s home.
This verse does not address pralaya directly; it teaches theological unity—Śiva and the Sun are regarded as non-different—within a household-ritual context.
It supports gṛhastha-dharma by prescribing regular domestic worship: recognizing the unity of major deities, one should establish disciplined home-ritual practice by worshipping Śiva (Śambhu) in the house.
Ritually, it authorizes household śiva-arcana (home worship of Śiva) grounded in the equivalence of Śiva and Sūrya; by implication for Vastu/ritual layout, it validates placing a Śiva focus in domestic sacred space.