Skanda Purana — Avanti Khanda, Shloka 21
सन्ध्याहीनोऽशुचिर्नित्यमनर्हः सर्वकर्मसु । यदन्यत्कुरुते किंचिन्न तस्य फलभाग्भवेत्
sandhyāhīno'śucirnityamanarhaḥ sarvakarmasu | yadanyatkurute kiṃcinna tasya phalabhāgbhavet
സന്ധ്യാവിധി ഉപേക്ഷിക്കുന്നവൻ നിത്യവും അശുചി, എല്ലാ കർമ്മങ്ങൾക്കും അനർഹൻ; അവൻ മറ്റെന്തു ചെയ്താലും അതിന്റെ ഫലം ലഭിക്കുകയില്ല।
Skanda (deduced)
Scene: A cautionary scene: a person attempting offerings while a shadow of impurity clings; beside him, a disciplined practitioner performing sandhyā with clear light—showing ‘fruitless’ vs ‘fruitful’ action.
FAQs
Daily obligatory worship (nitya-karma) sustains purity and makes other religious acts spiritually effective.
No specific site is named; it is a universal dharma rule stated within Revā Khaṇḍa.
Do not omit Sandhyā-vandana; it is prerequisite for the fruit of other rites.