Matsya Purana — Navagraha Sacrifice for Planetary Pacification and Prosperity
त्र्यङ्गुलस्य च विस्तारः सर्वेषां कथ्यते बुधैः दशाङ्गुलोच्छ्रिता भित्तिः स्थण्डिले स्यात्तथोपरि तस्मिन्नावाहयेद्देवान् पूर्ववत्पुष्पतण्डुलैः //
tryaṅgulasya ca vistāraḥ sarveṣāṃ kathyate budhaiḥ daśāṅgulocchritā bhittiḥ sthaṇḍile syāttathopari tasminnāvāhayeddevān pūrvavatpuṣpataṇḍulaiḥ //
The wise declare that the prescribed breadth for all these ritual features is three aṅgulas (finger-breadths). Upon the prepared altar-ground (sthaṇḍila), one should further raise a surrounding wall (bhitti) to a height of ten aṅgulas. On that altar arrangement, one should invoke the deities as before, using flowers and grains of rice.
This verse is not about Pralaya; it gives practical Vastu-ritual instructions—standard measurements and the method of invoking deities on a prepared altar ground.
It supports dharmic duty through correct ritual performance: a householder (or a king commissioning rites) should follow precise measurements and prescribed materials (flowers and rice) to properly invite the deities and maintain ritual order.
It specifies canonical dimensions (3 aṅgulas breadth; 10 aṅgulas height for the bhitti on the sthaṇḍila) and instructs avāhana—invoking deities using flowers and akṣata (rice grains)—a key step in consecration-style worship.