Matsya Purana — Agastya’s Origin
ततः कालेन महता तारकाद् अतिपीडितम् जगद्वीक्ष्य स कोपेन पीतवान्वरुणालयम् //
tataḥ kālena mahatā tārakād atipīḍitam jagadvīkṣya sa kopena pītavānvaruṇālayam //
Then, after a long time, seeing the world grievously tormented by Tāraka, he—angered—drank up Varuṇa’s abode, the realm of waters, the ocean.
It is not a Pralaya verse proper, but it uses a Pralaya-like motif: when cosmic order is crushed by a demon, a divine act affects the waters (Varuṇa’s realm), signaling drastic intervention to restore balance.
Indirectly, it models the dharmic principle that prolonged oppression must be checked: rulers are expected to notice public suffering (jagad vīkṣya) and act decisively to remove adharma, though human action must be measured rather than wrathful.
No direct Vāstu/temple rule appears, but the verse’s focus on waters (Varuṇa-ālaya) is relevant to ritual geography: sacred waters, tanks, and oceanic symbolism often frame Purāṇic rites and site selection themes in later Vāstu discussions.