Matsya Purana — Intermediate Dissolution
भुजंगो रज्जुरूपेण मनोः पार्श्वमुपागमत् भूतान्सर्वान्समाकृष्य योगेनारोप्य धर्मवित् //
bhujaṃgo rajjurūpeṇa manoḥ pārśvamupāgamat bhūtānsarvānsamākṛṣya yogenāropya dharmavit //
A serpent came to Manu’s side in the form of a rope; and the knower of Dharma, drawing all beings together, made them embark by the power of yoga.
It depicts the practical mechanics of survival during Pralaya: beings are gathered and made to embark, with divine/mystic assistance symbolized by the serpent appearing as a rope.
Manu is portrayed as a dharma-knower who protects and organizes the community in crisis—an ideal of rulership and household responsibility: safeguarding life, acting decisively, and upholding order.
No direct Vāstu or temple rule is stated; the key takeaway is ritual-symbolic logistics—using sacred means (yoga/divine aid) to preserve beings, a motif often echoed in Purāṇic rites of protection.