Skanda Purana — Mahesvara Khanda, Shloka 53
गंगोदकुम्भः स्याद्यद्वत्तन्मध्ये मद्य बिंदुना । अशिवज्ञस्य यो भुंक्ते शिवज्ञोऽपि तथैव सः
gaṃgodakumbhaḥ syādyadvattanmadhye madya biṃdunā | aśivajñasya yo bhuṃkte śivajño'pi tathaiva saḥ
Just as a pot of Gaṅgā-water is spoiled by a single drop of liquor mixed within it, so too one who eats the food of a person ignorant of Śiva becomes the same—even if he is a knower of Śiva.
Unspecified (context suggests a Purāṇic narrator in Māheśvarakhaṇḍa, likely Sūta/Lomaharṣaṇa addressing sages)
Tirtha: Gaṅgā
Type: river
Scene: A clear pot of Gaṅgā-water is shown; a single drop of liquor falls in, clouding it—intercut with a devotee hesitating before accepting food from a Śiva-ignorant host; Śiva’s presence is suggested as a luminous principle that must be honored.
FAQs
Even minor association can alter spiritual purity; food is treated as a powerful medium of influence.
Gaṅgā is referenced as the paradigmatic sacred purifier, though no particular tīrtha-location is specified.
Avoid eating from those described as ‘aśivajña’ (ignorant of Śiva), even if one is personally devout.