Matsya Purana — The Sarasvata Vrata: Vow for Sweet Speech
पञ्चम्यां प्रतिपक्षं च पूजयेद्ब्रह्मवासिनीम् तथैव तण्डुलप्रस्थं घृतपात्रेण संयुतम् क्षीरं दद्याद्धिरण्यं च गायत्री प्रीयतामिति //
pañcamyāṃ pratipakṣaṃ ca pūjayedbrahmavāsinīm tathaiva taṇḍulaprasthaṃ ghṛtapātreṇa saṃyutam kṣīraṃ dadyāddhiraṇyaṃ ca gāyatrī prīyatāmiti //
On the fifth lunar day (pañcamī), and also on its fortnightly counterpart (pratipakṣa), one should worship the goddess who abides in Brahman (Brahmavāsinī). Likewise, one should give a prastha-measure of rice together with a vessel of ghee, and also offer milk and gold, praying, “May Gāyatrī be pleased.”
This verse is not about pralaya; it focuses on vrata-dharma—specific calendrical worship (Pañcamī and the counter-fortnight) and gifts meant to please Gāyatrī.
It frames a householder-style duty: regular worship and dāna (rice, ghee, milk, gold) on prescribed tithis. For kings, it models royal piety through patronage and charity aligned with dharma.
The significance is ritual rather than architectural: it prescribes a Pañcamī observance with worship of Brahmavāsinī (Gāyatrī) and specified offerings/donations, including measured rice (prastha) and a ghee vessel.