Narada Purana — Purva Bhaga, Shloka 19
The Description of the Caturdaśī Vrata Observed throughout the Twelve Months
मुखे ददेद्धेमधेनुं रुद्रव्रतमिदं स्मृतम् । शुचिशुक्लचतुर्दश्यां शिवं संपूज्य मानवः ॥ १९ ॥
mukhe dadeddhemadhenuṃ rudravratamidaṃ smṛtam | śuciśuklacaturdaśyāṃ śivaṃ saṃpūjya mānavaḥ || 19 ||
当以“金牛”（hemadhenu）作仪礼之施，奉与堪受者——此即所称“鲁陀罗誓”（Rudra-vrata）。于清净之白分十四日（Śukla Caturdaśī），人当如法礼敬湿婆（Śiva），则此誓圆满。
Narada (teaching in dialogue tradition, commonly framed within Narada–Sanatkumara discourse)
Vrata: Rudra-vrata
Primary Rasa: bhakti
Secondary Rasa: shanta
FAQs
It defines a specific Śaiva observance (Rudra-vrata): worship of Śiva on Śukla Caturdaśī combined with dana (the gift of a golden cow), presenting devotion and generosity as a single integrated religious act.
Bhakti is expressed through saṃpūjā—complete worship of Śiva on an auspicious tithi—showing that devotion is not only inner reverence but also disciplined practice aligned with sacred time.
Kalā/astronomical timing (Vedāṅga Jyotiṣa in practice) is implied through the specified tithi—Śukla Pakṣa Caturdaśī—indicating that correct ritual observance depends on precise lunar calendrical reckoning.