Matsya Purana — Dialogue of Aṣṭaka and Yayāti: Exhaustion of Merit
पुण्यां योनिं पुण्यकृतो विशन्ति पापां योनिं पापकृतो व्रजन्ति कीटाः पतंगाश्च भवन्ति पापान् न मे विवक्षास्ति महानुभाव //
puṇyāṃ yoniṃ puṇyakṛto viśanti pāpāṃ yoniṃ pāpakṛto vrajanti kīṭāḥ pataṃgāśca bhavanti pāpān na me vivakṣāsti mahānubhāva //
Doers of merit enter a meritorious womb, while doers of sin go to a sinful womb. Because of sins, one becomes a worm or an insect. I do not wish to speak further of these matters, O great-souled one.
This verse does not describe Pralaya; it explains karmic causality—how merit and sin determine one’s next embodiment (yoni), including lower births like insects.
It reinforces the Matsya Purana’s ethical framework: rulers and householders must cultivate puṇya through dharmic conduct (charity, restraint, protection of beings) and avoid pāpa, since actions directly shape future birth and status.
No Vastu/temple-architecture rule is stated in this verse; its significance is moral and soteriological—ritual and right conduct are implied as sources of puṇya that elevate one’s yoni.