Matsya Purana — Origin of Soma
ततस्तुष्टस्तु भगवांस् तस्मै नारायणो हरिः वरं वृणीष्व प्रोवाच परमात्मा जनार्दनः //
tatastuṣṭastu bhagavāṃs tasmai nārāyaṇo hariḥ varaṃ vṛṇīṣva provāca paramātmā janārdanaḥ //
Then, pleased, the Blessed Lord—Nārāyaṇa, Hari, the Supreme Self, Janārdana—said to him: “Choose a boon.”
It signals divine intervention just before the Pralaya narrative intensifies: the Lord, pleased with Manu, offers a boon—typically the turning point where protection and guidance for surviving the deluge are granted.
Manu’s reception of a boon implies that righteous conduct, restraint, and devotion invite divine favor—an ethical model for rulers and householders: perform duties faithfully, and seek boons aligned with dharma rather than personal indulgence.
No direct Vāstu/temple rule appears in this verse; its ritual takeaway is the principle of divine “vara-pradāna” (boon-bestowal) as a fruit of devotion, often framed in Purāṇic ritual contexts of praise, vows, and worship.