Matsya Purana — The Madana-Dvādaśī Vow and the Birth of the Maruts
दित्यां गर्भम् अथाधत्त कश्यपः प्राह तां पुनः त्वया यत्नो विधातव्यो ह्य् अस्मिन्गर्भे वरानने //
dityāṃ garbham athādhatta kaśyapaḥ prāha tāṃ punaḥ tvayā yatno vidhātavyo hy asmingarbhe varānane //
Then Kashyapa implanted a conception in Diti, and again addressed her: “O fair-faced one, you must exercise great care and discipline regarding this pregnancy.”
This verse is not about Pralaya; it belongs to the creation/genealogical stream, emphasizing how disciplined conduct around conception shapes the birth and nature of progeny.
It reflects the householder ethic that conception and pregnancy are dharmic acts requiring restraint, purity, and careful observance—implying that personal discipline supports social and cosmic order.
No Vāstu or temple-building rule is stated; the ritual takeaway is the importance of niyama (regulated conduct) during pregnancy, a common Purāṇic theme tied to auspicious outcomes.