Matsya Purana — Dynastic Genealogies: Paurava–Anu Lines
शूद्रां धात्रेयिकां तस्माव् अन्धाय प्राहिणोत्तदा तस्यां कक्षीवदादींश्च शूद्रयोनाव् ऋषिर् वशी //
śūdrāṃ dhātreyikāṃ tasmāv andhāya prāhiṇottadā tasyāṃ kakṣīvadādīṃśca śūdrayonāv ṛṣir vaśī //
Therefore, at that time he sent a Śūdra woman—Dhātreyikā—to Andha; and through her, the self-controlled seer begot Kakṣīvān and others, born from a Śūdra womb.
Nothing directly—this verse is genealogical, describing lineage and birth through a particular womb rather than cosmic dissolution or the Great Flood narrative.
Indirectly, it reflects Purāṇic social-history themes: alliances, progeny, and lineage transmission. In royal/householder ethics, such passages are used to frame ancestry, legitimacy, and the continuity of family lines rather than prescribing a specific duty here.
None is stated in this śloka; it is not a Vāstu/temple-building or ritual-procedure verse but a brief note in a genealogy/ṛṣi-lineage context.