Matsya Purana — Account of the Manvantaras: Manus
सप्तैव ऋषयः पूर्वे ये मरीच्यादयः स्मृताः आग्नीध्रश्चाग्निबाहुश्च सहः सवन एव च //
saptaiva ṛṣayaḥ pūrve ye marīcyādayaḥ smṛtāḥ āgnīdhraścāgnibāhuśca sahaḥ savana eva ca //
Indeed, there were seven ancient sages (ṛṣis), remembered as beginning with Marīci; and (among them were) Āgnīdhra, Agnibāhu, Saha, and also Savana.
This verse does not describe Pralaya directly; it anchors cosmic history by naming primordial sages (Saptarishis) who preserve and transmit sacred knowledge across ages.
By emphasizing remembered lineages of ṛṣis, the verse supports a key Purāṇic ethic: rulers and householders should uphold dharma through respect for tradition (smṛti), teachers, and properly transmitted knowledge.
No explicit Vāstu or temple rule appears here; the ritual takeaway is the authority of ṛṣi-lineages as sources for correct rites and calendrical/ceremonial practice preserved through named seers.