Matsya Purana — Soma
द्विलवं कुहूमात्रं च तावुभौ तु निधाय सः सिनीवालीप्रमाणाल्पकुहूमात्रव्रतोदये //
dvilavaṃ kuhūmātraṃ ca tāvubhau tu nidhāya saḥ sinīvālīpramāṇālpakuhūmātravratodaye //
Placing (as an offering/measure) two lavas and also a measure corresponding to Kuhū—having deposited both—he should commence the observance at the proper rise of the vow, taking Sinīvālī as the standard and Kuhū in a smaller measure.
This verse does not address pralaya; it focuses on precise tithi-based ritual procedure and measurement for beginning a vow connected with Sinīvālī and Kuhū.
It frames dharma as careful observance of prescribed vows: a king or householder should begin vratas at the correct time (udaya) and follow exact measures, indicating discipline, purity, and adherence to scriptural procedure.
The significance is ritual-technical: it specifies measured quantities (two lavas and a Kuhū-measure) and a proportional rule—Sinīvālī as the baseline with Kuhū taken in a smaller measure—used when initiating the vrata.