Matsya Purana — Saptamī Sacred Bath and the Mṛtavatsābhiṣeka Rite for Pacifying Misfortune an...
भविष्यति च वाराहो यत्र कल्पस्तपोधन वैवस्वतश्च तत्रापि यदा तु मनुरुत्तमः //
bhaviṣyati ca vārāho yatra kalpastapodhana vaivasvataśca tatrāpi yadā tu manuruttamaḥ //
O ascetic rich in austerities, there will be in the future a Varāha-kalpa; and in that same cycle there will also be the Vaivasvata Manvantara, when the excellent Manu arises to preside.
It situates events within repeating cosmic cycles (kalpas and manvantaras), implying that creation and dissolution recur in structured epochs such as the Varāha-kalpa and the Vaivasvata period.
By naming Vaivasvata Manu—the archetypal lawgiver—this verse points to the Manvantara framework in which dharma is re-established; kings and householders are expected to align conduct with Manu-led order in each epoch.
No direct Vāstu or ritual procedure is stated; the significance is contextual—Vāstu and rites are traditionally taught as valid within a given kalpa/manvantara, so the verse anchors such prescriptions within cosmic time.