Ramayana
सस्फुलिङ्गस्सधूमार्चिस्सधूमकलुषोदयः । मन्त्रसङ्घहुतोऽप्यग्निर्नसम्यगभिवर्थते ॥ ६-१०-१५
"Even if the sacrificial fire is fed with oblations while uttering a proper set of Mantras (Spiritual texts), fire particles polluted with smoke are rising and the fire is not burning with brilliance. ॥ 6-10-15॥
english translation
sasphuliGgassadhUmArcissadhUmakaluSodayaH । mantrasaGghahuto'pyagnirnasamyagabhivarthate ॥ 6-10-15
hk transliteration by Sanscript