Matsya Purana — Characteristics of Dvāpara and Kali Yugas
ततः संध्यांशके काले सम्प्राप्ते च युगान्तिके स्थितास्वल्पावशिष्टासु प्रजास्विह क्वचित् क्वचित् //
tataḥ saṃdhyāṃśake kāle samprāpte ca yugāntike sthitāsvalpāvaśiṣṭāsu prajāsviha kvacit kvacit //
Then, when the twilight-fraction of the age arrived and the end of the Yuga drew near, the creatures here and there remained only in scant, residual numbers.
It depicts the yuga-twilight (sandhyāṃśa) when the yuga-end approaches and living beings become scarce, a hallmark condition leading into broader dissolution themes.
By stressing scarcity and decline near a yuga’s end, it implies heightened need for dharma—protection of remaining subjects (prajā), restraint, and preservation of social order when populations and stability diminish.
No direct Vāstu or ritual rule is stated; the verse functions as cosmological timing (yuga-sandhi) that later texts often use to frame when rites, reforms, or preservative actions become especially urgent.