Matsya Purana — Śrāddha Procedure: Types
विट्पीतं मातुलं बन्धुम् ऋत्विगाचार्यसोमपान् यश्च व्याकुरुते वाक्यं यश्च मीमांसते ऽध्वरम् //
viṭpītaṃ mātulaṃ bandhum ṛtvigācāryasomapān yaśca vyākurute vākyaṃ yaśca mīmāṃsate 'dhvaram //
One should properly recognize and honor the maternal uncle and other kinsmen, those who have shared one’s food, the officiating priests (ṛtvij) and teachers (ācārya), and those entitled to Soma-drink; as well as the person who explains the Vedic utterance and the one who investigates and determines the procedure of the sacrifice (adhvara).
This verse is not about Pralaya; it focuses on ritual-dharma—identifying and honoring key persons connected with yajña, Vedic instruction, and sacrificial interpretation.
It frames social and religious obligations: a householder (and by extension a king as protector of dharma) should respect relatives, those bound by shared hospitality, and especially ritual experts—priests, teachers, and interpreters of Vedic injunctions—since yajña depends on their authority and correct procedure.
The significance is ritual, not architectural: it highlights the roles of ṛtvij and ācārya, the entitlement to Soma, and the necessity of vyākhyāna (expounding Vedic statements) and mīmāṃsā (systematic inquiry) to ensure the sacrifice (adhvara) is performed correctly.