Shiva Purana
अग्निवर्णास्तु तप्ताश्च त्रिशाखा लोहशंकवः ॥ आखिद्यंते च बहुशः स्थानेष्वेतेषु मुद्गरैः ॥ २३ ॥
They were of the color of fire and burnt with three branches and iron cones They are often pierced with hammers in these places.
english translation
agnivarNAstu taptAzca trizAkhA lohazaMkavaH ॥ AkhidyaMte ca bahuzaH sthAneSveteSu mudgaraiH ॥ 23 ॥
hk transliteration by Sanscript