Matsya Purana — Dialogue of Aṣṭaka and Yayāti: Exhaustion of Merit
चत्वारि कर्माणि भयंकराणि भयं प्रयच्छन्त्ययथाकृतानि मानाग्निहोत्रमुत मानमौनं मानेनाधीतमुत मानयज्ञः //
catvāri karmāṇi bhayaṃkarāṇi bhayaṃ prayacchantyayathākṛtāni mānāgnihotramuta mānamaunaṃ mānenādhītamuta mānayajñaḥ //
Four acts become dreadful and bring fear when performed wrongly: the fire-offering (agnihotra) done with pride, silence (mauna) observed with pride, study pursued with pride, and sacrifice (yajña) undertaken with pride.
This verse does not address pralaya; it teaches ethical ritual discipline—warning that pride corrupts sacred acts and leads to भय (fearful consequences).
It advises both rulers and householders that Vedic duties—Agnihotra, vows like silence, scriptural study, and yajña—must be done with humility and correct procedure; performing them for ego (māna) undermines dharma and invites social and spiritual downfall.
The ritual takeaway is central: Agnihotra and yajña must be performed according to vidhi (proper injunctions) and without pride; the verse frames “wrongly done” (ayathākṛta) rites as spiritually dangerous.