Matsya Purana — Pitṛ Worlds
सुस्वधा नाम पितरो यत्र तिष्ठन्ति सुव्रताः आज्यपा नाम लोकेषु कर्दमस्य प्रजापतेः //
susvadhā nāma pitaro yatra tiṣṭhanti suvratāḥ ājyapā nāma lokeṣu kardamasya prajāpateḥ //
In that realm dwell the Pitṛs known as Susvadhā—virtuous and faithful to their vows. In the worlds assigned to the ancestral hosts are also those called Ājyapā, belonging to Prajāpati Kardama.
This verse does not describe Pralaya directly; it maps the cosmic arrangement of Pitṛ-groups (Susvadhā, Ājyapā) and their realms, a standard cosmological catalog within sarga/manvantara-style narration.
By identifying Pitṛ classes and their cosmic stations, it supports the Purāṇic foundation for śrāddha and ancestor-offerings—key householder duties—and reinforces the king’s role in upholding Vedic-Purāṇic rites that sustain social-religious order.
Ritually, it points to the Pitṛ-centric framework behind śrāddha and offerings (notably ājya/ghee, echoed by the name Ājyapā). It contains no direct Vāstu or temple-architecture rule, but it underpins why Pitṛ rites are performed with specific substances and intent.