Matsya Purana — Kārtavīrya Arjuna’s Solar Boon and the Genealogy from Kroṣṭu to the Yādava Lines
षष्टिश्च पूर्वपुरुषाः सहस्राणि च सप्ततिः एते ऽमृतत्वं सम्प्राप्ता बभ्रोर् देवावृधान्नृप //
ṣaṣṭiśca pūrvapuruṣāḥ sahasrāṇi ca saptatiḥ ete 'mṛtatvaṃ samprāptā babhror devāvṛdhānnṛpa //
Sixty and seventy thousand of the ancient forefathers—these all attained immortality, O King, through the lineage of Babhru and the Deva-vṛddhas.
This verse is not describing Pralaya; it belongs to a genealogical enumeration, highlighting a group of ancient forefathers said to have attained “amṛtatva” (deathlessness/immortality) through a particular lineage or class (Babhru and the Deva-vṛddhas).
Indirectly, it supports the Purāṇic ideal that kings should preserve lineage memory (vaṃśa-smṛti), honor ancestral traditions, and uphold dharma so that the “forefathers” and their exemplary lines remain models for righteous governance.
No Vāstu or temple-building rule is stated in this verse; its ritual takeaway is primarily ancestral—affirming the Purāṇic emphasis on venerating forefathers and maintaining lineage-based sacred memory.