Matsya Purana — The Attendant Hosts of the Sun and Moon: Monthly Gaṇas
मधुमाधवयोर्ह्येष गणो वसति भास्करे वसन्ग्रीष्मे तु द्वौ मासौ मित्रश्च वरुणश्च वै //
madhumādhavayorhyeṣa gaṇo vasati bhāskare vasangrīṣme tu dvau māsau mitraśca varuṇaśca vai //
This very troop (of deities) abides in the Sun during the months of Madhu and Mādhava. In the seasons of spring and summer, those two months are indeed presided over by Mitra and Varuṇa.
It does not describe Pralaya directly; it outlines cosmic order through timekeeping—how deities are assigned to the Sun across specific months and seasons, reflecting ṛta (regulated order) rather than dissolution.
By identifying the presiding deities of months/seasons, it supports dharmic scheduling—choosing appropriate times for vows, donations, public rites, and seasonal responsibilities (e.g., governance, agriculture, and household observances) in alignment with the Purāṇic calendar.
Ritually, it aids Surya-related observances by linking months to specific deities (Mitra and Varuṇa), which can guide mantra/devatā selection and seasonal worship; it does not provide direct Vāstu or temple-construction rules in this verse.