Matsya Purana — Characteristics of Dvāpara and Kali Yugas
वल्कलान्यथ वासांसि अधःशय्याश्च सर्वशः परिग्रहो न तेष्वस्ति धनशुद्धिमवाप्नुयुः //
valkalānyatha vāsāṃsi adhaḥśayyāśca sarvaśaḥ parigraho na teṣvasti dhanaśuddhimavāpnuyuḥ //
Wearing bark-garments and simple clothes, and sleeping on the ground in every way—when there is no possessiveness toward such things, they attain purity of wealth.
This verse is not about Pralaya; it teaches an ethical discipline—detachment from possessions—as a means to inner and material purity (dhana-śuddhi).
It frames “purity of wealth” as rooted in non-possessiveness: even when one uses clothing and bedding (necessary supports of life), one should avoid grasping, hoarding, or identity-based attachment—an ideal applicable to rulers and householders managing resources.
No Vāstu or temple-architecture rule is stated here; the ritual takeaway is the value of simplicity and non-attachment as a supporting virtue for purity in religious life.