Matsya Purana — Agastya’s Origin
*ईश्वर उवाच पुरा पुराणपुरुषः कदाचिद्गन्धमादने भूत्वा धर्मसुतो विष्णुश् चचार विपुलं तपः //
*īśvara uvāca purā purāṇapuruṣaḥ kadācidgandhamādane bhūtvā dharmasuto viṣṇuś cacāra vipulaṃ tapaḥ //
Īśvara said: Long ago, the Primeval Person (Purāṇapuruṣa) once, upon Gandhamādana mountain, became known as Dharma’s son; and as Viṣṇu he undertook abundant austerities.
This verse does not describe Pralaya directly; it emphasizes the timeless, pre-cosmic status of the Purāṇapuruṣa (Primeval Person) who can assume forms and undertake tapas—an idea that underlies Puranic cycles of creation and dissolution.
By portraying Viṣṇu himself practicing vipula-tapas, the verse elevates austerity and self-discipline as core supports of dharma—values mirrored in the king’s restraint and the householder’s regulated conduct, charity, and vows.
No direct Vāstu or temple rule appears here; the ritual takeaway is the sanctity of tapas performed at sacred sites like Gandhamādana, reinforcing the Puranic principle that place (kṣetra) and disciplined practice amplify spiritual merit.