Narada Purana — Purva Bhaga, Shloka 72
The Exposition of the Saptamī Vow Observed Across Twelve Months
Saptamī-vrata-prakāśana
सर्वासु सर्वमासेषु सप्तमीषु द्विजोत्तमः । भास्कराराधनं प्रोक्तं सर्वकामिकमित्यलम् ॥ ७२ ॥
sarvāsu sarvamāseṣu saptamīṣu dvijottamaḥ | bhāskarārādhanaṃ proktaṃ sarvakāmikamityalam || 72 ||
噢，最胜的再生者啊，在每月每一个萨普塔弥（第七日）之时，应礼敬婆斯迦罗——太阳神；此供奉被宣说为自足圆满，能成就一切所愿。
Narada (teaching in dialogue, traditionally to Sanatkumara and the Kumaras)
Vrata: Saptamī-vrata (Sun-worship on Saptamī)
Primary Rasa: bhakti
Secondary Rasa: shanta
FAQs
It elevates regular Sun-worship on Saptamī as a universally applicable monthly observance, presenting Surya-upāsanā as a complete and sufficient means for attaining desired righteous aims.
By prescribing consistent ārādhana (devotional worship) of Bhāskara on a recurring sacred tithi, it frames devotion as disciplined, periodic practice that yields both inner and outer fruits.
It relies on calendrical/tithi-based timing (Jyotiṣa/Vedic astrology) by specifying Saptamī across all months as the proper ritual occasion for Surya worship.