Matsya Purana — Soma
द्वौ द्वौ लवावमावास्यां स कालः पर्वसंधिषु द्व्यक्षरः कुहूमात्रश्च पर्वकालस्तु स स्मृतः //
dvau dvau lavāvamāvāsyāṃ sa kālaḥ parvasaṃdhiṣu dvyakṣaraḥ kuhūmātraśca parvakālastu sa smṛtaḥ //
On the Amāvāsyā day, at the junctions of the parva (parva-sandhi), the time is constituted by two and two lavas. That parva-time is traditionally understood as consisting of two akṣaras and extending only for the measure called kuhū.
This verse is not about pralaya; it defines precise ritual time-units around parva-sandhi on amāvasyā, indicating the text’s concern with correct timing for rites rather than cosmic dissolution.
Kings and householders are expected to perform śrāddha, dāna, and other rites at correct parva-sandhi timings; this verse supplies a technical rule for determining that auspicious/required interval on amāvasyā.
Ritually, parva-kāla is a narrow, defined window (measured in lavas/kuhū) used to time ceremonies; in temple practice and Vastu-linked consecrations, accurate muhurta selection depends on such parva-sandhi calculations.