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So, means "The sacred ash is the mantra" — praising the spiritual power of wearing holy ash (vibhuthi) on the body, especially the forehead. The hymn emphasizes that for devotees of Lord Shiva, vibhuthi is not just a ritual mark but the very embodiment of mantras, purity, and liberation.
It is the core of all spiritual techniques (tantra) and wisdom. manthiramavathu neeru thevaram lyrics in english link
Manthiramavathu neeru, mathiyathavathu neeru Santhathamum punai tholgal, samayaththukku neerai allal Vera gathi yavum kaneer – enriru Viboothiyai ani – kattuvom. So, means "The sacred ash is the mantra"
You can find the complete set of verses in English on Scribd's Thiruneetru Pathigam guide . mathiyathavathu neeru Santhathamum punai tholgal