Skanda Purana — Mahesvara Khanda, Shloka 19
ततो गायत्रिपूतं यद्द्विजास्तोयं क्षिपंति च । तेन दह्यंति ते पापाः संध्योपासनतः सदा
tato gāyatripūtaṃ yaddvijāstoyaṃ kṣipaṃti ca | tena dahyaṃti te pāpāḥ saṃdhyopāsanataḥ sadā
তেতিয়া গায়ত্ৰী-মন্ত্ৰে পবিত্ৰ কৰা যি জল দ্বিজসকলে ছিটিয়াই দিয়ে, সেই জলে পাপীসকল দগ্ধ হয়; সেয়েহে সন্ধ্যা-উপাসনাৰ দ্বাৰা তেওঁলোক সদায় দহনভোগ কৰে।
Lomaharṣaṇa (Sūta) to the sages (deduced)
Scene: A twice-born worshipper at riverbank at twilight, holding kuśa and water-vessel, offering arghya; the water, luminous with Gāyatrī, becomes a fiery stream that scorches embodied sins depicted as dark shadow-forms retreating.
FAQs
Daily discipline (sandhyā) empowered by mantra (Gāyatrī) is depicted as a real spiritual force that destroys inner and outer negativity.
No particular site is named; the merit is tied to the universal rite of sandhyā and arghya.
Offering/casting water sanctified by Gāyatrī during sandhyā (arghya), as part of regular twilight worship.