Matsya Purana — Manvantaras
गत्यर्थाद् ऋषतेर् धातोर् नामनिर्वृत्तिकारणम् यस्मादेष स्वयंभूतस् तस्माच्च ऋषिता मता //
gatyarthād ṛṣater dhātor nāmanirvṛttikāraṇam yasmādeṣa svayaṃbhūtas tasmācca ṛṣitā matā //
Because the name is derived from the verbal root ṛṣ, used in the sense of ‘going/moving’, this is the cause of the word’s formation. And since this one is svayaṃbhū (self-born), he is therefore regarded as possessing ṛṣitā—true Ṛṣi-hood.
It supports a creation-oriented idea by identifying a “self-born” (svayaṃbhū) being and explaining Ṛṣi-hood as a primordial category, not a pralaya event.
By defining what counts as a true Ṛṣi, it implicitly guides kings and householders to recognize authentic spiritual authority and seek instruction from realized sages rather than mere ritualists.
No direct Vāstu or temple-rule detail is stated; the ritual takeaway is definitional—ṛṣi status is grounded in intrinsic spiritual origin/realization (svayaṃbhū) and authoritative linguistic tradition.