Narada Purana — Purva Bhaga, Shloka 56
The Exposition of the Dvādaśī Vow for the Twelve Months
Dvādaśī-vrata-nirṇaya and Mahā-dvādaśī Lakṣaṇas
त्वष्टा विवस्वान्सविता विष्णुर्द्वादश ईरिताः । प्रतिमासं तु शुक्लायां द्वादश्यामर्च्य यत्नतः ॥ ५६ ॥
tvaṣṭā vivasvānsavitā viṣṇurdvādaśa īritāḥ | pratimāsaṃ tu śuklāyāṃ dvādaśyāmarcya yatnataḥ || 56 ||
如是，十二种（按月）形相已被宣说——其中有特瓦什塔（Tvaṣṭā）、毗婆斯梵（Vivasvān）、娑毗多（Savitā）以及毗湿奴（Viṣṇu）。每个月在白半月的第十二日（Śukla Dvādaśī），应当勤恳礼拜供养。
Narada (teaching in the Narada Purana dialogue tradition, commonly transmitted via Suta)
Vrata: Dvādaśa-Āditya-vrata
Primary Rasa: bhakti
Secondary Rasa: shanta
FAQs
It links devotion to a disciplined sacred calendar: by honoring the divinity expressed through the Sun’s named forms on Śukla Dvādaśī each month, the practitioner aligns worship with cosmic order (ṛta) and sustains steady bhakti.
Bhakti is presented as regular, time-honored practice—monthly worship performed “yatnataḥ” (with careful effort). The mention of Viṣṇu among the forms underscores that devotion to Viṣṇu can be cultivated through such vrata-based, tithi-centered worship.
It highlights calendrical discipline—knowing tithi (Dvādaśī) and the bright fortnight (śukla pakṣa), which relates to Jyotiṣa (Vedāṅga astrology/astronomy) used for timing rituals correctly.