Matsya Purana — Navagraha Sacrifice for Planetary Pacification and Prosperity
चतुरस्रा समन्ताच्च त्रिभिर्वप्रैस्तु संयुता वप्रप्रमाणं पूर्वोक्तं वेदीनां च तथोच्छ्रयः //
caturasrā samantācca tribhirvapraistu saṃyutā vaprapramāṇaṃ pūrvoktaṃ vedīnāṃ ca tathocchrayaḥ //
The vedi (platform) should be square on all sides and furnished with three ramparts (vapras). The measure of the ramparts has been stated earlier, and likewise the prescribed elevation of the vedis.
This verse is not about Pralaya; it belongs to the Matsya Purana’s Vastuvidya instructions, specifying the shape and structural components of a vedi (platform/altar).
It supports dharmic duty by prescribing correct construction standards for sacred/ritual spaces; a king or householder is expected to commission or maintain such works according to scriptural measurements.
It mandates a square vedi with three vapras (embankments/parapets) and refers to standardized measurements and height—key Vastu principles for stable, ritually valid construction.