Matsya Purana — Rite and Layout for Consecrating Ponds
त्र्यरत्निमात्रो यूपः स्यात् क्षारवृक्षविनिर्मितः यजमानप्रमाणो वा संस्थाप्यो भूतिमिच्छता //
tryaratnimātro yūpaḥ syāt kṣāravṛkṣavinirmitaḥ yajamānapramāṇo vā saṃsthāpyo bhūtimicchatā //
The sacrificial post (yūpa) should be of the measure of three aratnis (cubits) and made from a kṣāra-bearing tree; or else it may be set up in proportion to the sacrificer’s own measure—by one who seeks prosperity and auspicious success.
This verse is not about Pralaya; it gives a practical yajña rule—how to size and select the wood for the yūpa so the rite yields auspicious results.
It frames ritual performance as a dharmic duty: a patron (including a householder or king) should follow prescribed standards of measurement and materials when sponsoring sacrifices for prosperity and welfare.
It specifies the yūpa’s canonical height (three cubits) or proportional sizing to the yajamāna, and mandates a ritually appropriate wood—showing the importance of sacred measurement (pramāṇa) and material selection in yajña practice.