Skanda Purana — Nagara Khanda, Shloka 32
दुर्वासा उवाच । नभस्ये चासिते पक्षे तृतीयादिवसे स्थिते । प्रातरुत्थाय पश्चाच्च भक्षयेद्दंतधावनम्
durvāsā uvāca | nabhasye cāsite pakṣe tṛtīyādivase sthite | prātarutthāya paścācca bhakṣayeddaṃtadhāvanam
দুর্বাসা বলিলেন—নভস্য মাসের কৃষ্ণপক্ষে তৃতীয়া তিথি উপস্থিত হলে, প্রাতে উঠিয়া পরে কেবল দন্তধাবন (দাঁত-মাজার দাতন/মঞ্জন) মাত্রই আহাররূপে গ্রহণ করিবে।
Durvāsā
Scene: A dawn scene: an ascetic authority (Durvāsā) instructs a devotee; the devotee rises, performs dantadhāvana, and prepares for a strict fast on kṛṣṇa-tṛtīyā.
FAQs
Purāṇic vows are time-bound and discipline-based; bodily restraint and precise timing are taught as supports for spiritual merit.
This verse gives calendrical and disciplinary instructions; it does not name a particular tīrtha.
Begin the observance in Nabhasya (Bhādrapada), dark fortnight, on tṛtīyā; rise early and adhere to a strict intake rule connected with dantadhāvana (tooth-cleaning).