Matsya Purana — Marks of Karma-yoga and the Five Great Daily Sacrifices
कथयामास विश्वात्मा मनवे सूर्यसूनवे कर्मयोगं च सांख्यं च यथावद्विस्तरान्वितम् //
kathayāmāsa viśvātmā manave sūryasūnave karmayogaṃ ca sāṃkhyaṃ ca yathāvadvistarānvitam //
Then the All-Self, the Universal Spirit, explained to Manu, the son of the Sun, both Karma-yoga and Sāṃkhya—properly and in full detail.
Directly, it does not describe Pralaya; instead, it frames the post-crisis transmission of dharma—Matsya instructs Manu in Karma-yoga and Sāṃkhya, the knowledge needed to sustain order in any age.
By pairing Karma-yoga (right action and duty without selfish attachment) with Sāṃkhya (discriminative insight), the verse presents a complete ethic: rulers and householders should act responsibly while grounding decisions in clear spiritual discernment.
No explicit Vāstu or ritual procedure is stated in this verse; its significance is foundational—these teachings are the philosophical basis that later supports correct ritual conduct and rule-based disciplines (including temple/ritual systems) in the Purāṇa.