Skanda Purana — Mahesvara Khanda, Shloka 91
क्षालिताः पूरिता नीताः षडक्षरजपेन च । गडुकाष्चशतं कुर्यादथवाप्यष्टविंशतिः
kṣālitāḥ pūritā nītāḥ ṣaḍakṣarajapena ca | gaḍukāṣcaśataṃ kuryādathavāpyaṣṭaviṃśatiḥ
それらを洗い清めて満たし、（供養のために）運び入れ、六字の真言を唱えつつ行うべきである。ガドゥカ（gaḍuka）を百個整えるか、さもなくば少なくとも二十八個とせよ。
Lomaharṣaṇa (Sūta) to the sages (deduced from Māheśvarakhaṇḍa context)
Type: temple
Scene: A devotee in a Śiva temple courtyard washes and fills many small water-pots (gaḍukas), arranging them neatly for liṅga worship while softly repeating a six-syllable mantra; lamps and bilva leaves are nearby.
FAQs
Ritual action should be joined to mantra; external preparation becomes sacred when performed with japa.
No specific tīrtha is mentioned; it is a general prescription for Śiva-ritual.
Wash, fill, and bring the gaḍukas while doing ṣaḍakṣara-japa; prepare 100 pots, or at least 28.