Matsya Purana — Mandāra-Saptamī Vrata
विप्रान् सम्पूजयित्वा तु मन्दारं प्राशयेन्निशि ततः प्रभात उत्थाय कृत्वा स्नानं पुनर्द्विजान् //
viprān sampūjayitvā tu mandāraṃ prāśayenniśi tataḥ prabhāta utthāya kṛtvā snānaṃ punardvijān //
Having duly honored the Brahmins, one should at night partake of (or administer) mandāra; then, rising at dawn and performing the ritual bath, one should again attend to and honor the dvija, the twice-born.
This verse is not about Pralaya; it focuses on ritual discipline—honoring Brahmins, a night observance involving mandāra, and purification by bathing at dawn.
It frames a dharmic routine: respectful service to Brahmins (brāhmaṇa-pūjā), regulated conduct at night, and morning purification—core expectations for both a righteous king and a disciplined householder in Purāṇic ethics.
Ritually, it emphasizes sequencing: honor officiants/learned Brahmins, perform the prescribed night act (mandāra), then cleanse at dawn before resuming rites—purity and proper order are prerequisites for many temple and domestic rituals.