Matsya Purana — Agastya’s Origin
तपसा तस्य भीतेन विघ्नार्थं प्रेषितावुभौ शक्रेण माधवानङ्गाव् अप्सरोगणसंयुतौ //
tapasā tasya bhītena vighnārthaṃ preṣitāvubhau śakreṇa mādhavānaṅgāv apsarogaṇasaṃyutau //
Frightened by his austerity, Śakra (Indra) dispatched the two—Mādhava and Anaṅga—together with a troop of Apsarases, in order to create an obstacle to his penance.
This verse is not about Pralaya; it highlights a common Puranic motif where intense tapas creates spiritual potency that even Indra fears, prompting attempts to obstruct the ascetic.
It underscores the ethical ideal of self-mastery: rulers and householders are warned that sense-temptations and distractions can derail vows and duties, so discipline (dama) and steadiness in dharma are essential.
No Vastu/temple-architecture rule appears here; the ritual takeaway is about tapas as a potent rite and the concept of vighna—obstacles that may arise during serious observances.