Shiva Purana — Rudra Samhita, Shloka 58
गाणपत्यदानकथा
Bāṇāsura Receives Gaṇapatya; Genealogical Prelude
अस्मिंस्तु कार्तिके मासि ऋतुधर्मास्तु माधवे । द्वादश्यां शुक्लपक्षे तु यस्तु घोरे निशागमे
asmiṃstu kārtike māsi ṛtudharmāstu mādhave | dvādaśyāṃ śuklapakṣe tu yastu ghore niśāgame
在迦尔提迦月（Kārtika）——同样在摩陀婆月（Mādhava，即毗舍迦 Vaiśākha），当季节性的修持被规定之时——于白半月第十二日（Dvādaśī），凡在夜色可怖将临之际行此仪轨者……
Suta Goswami (narrating the Purana to the sages at Naimisharanya)
Tattva Level: pasha
FAQs
It highlights sacred time (Kārtika/Vaiśākha and Śukla-Dvādaśī) as especially potent for vrata and worship, implying that disciplined observance and night-vigil intensify devotion and inner purification—key Shaiva means for loosening pāśa (bondage) and turning the mind toward Pati (Shiva).
By prescribing auspicious calendrical conditions for observance, it supports Saguna worship—timed pūjā, dīpa, japa, and upāsanā—commonly centered on the Śiva-liṅga, where the devotee approaches the compassionate manifest Lord while progressing toward deeper realization.
A Śukla-Dvādaśī night observance (vrata) is implied: maintain purity and restraint, keep a night vigil, and perform Shiva-upāsanā such as pañcākṣarī japa ("Om Namaḥ Śivāya"), liṅga-archana, and (where traditional) bhasma/rudrākṣa-assisted meditation.