Matsya Purana — Account of the Manvantaras: Manus
तपोभागी तपोयोगी धर्माचाररताः सदा तामसस्य सुताः सर्वे दश वंशविवर्धनाः //
tapobhāgī tapoyogī dharmācāraratāḥ sadā tāmasasya sutāḥ sarve daśa vaṃśavivardhanāḥ //
All ten sons of Tāmasa, endowed with the fruits of austerity, devoted to ascetic discipline, and ever delighting in righteous conduct, became increasers of their family lineages.
This verse does not describe Pralaya directly; it highlights continuity after cosmic cycles by stressing righteous progeny who preserve and expand lineages across Manvantara periods.
It presents the ideal of householders or rulers who uphold dharma and practice disciplined tapas—virtues that stabilize society and ensure legitimate, dharmic continuation of the family line.
No Vāstu or temple-ritual rule is stated here; the ritual emphasis is indirect—tapas and dharmācāra imply regular observances (vrata, yajña, and ethical discipline) that support social and religious order.