Shiva Purana
द्वादशास्यं तु रुद्रा क्षं धारयेत्केशदेशके । आदित्याश्चैव ते सर्वेद्वादशैव स्थितास्तथा ७८ ।
One shall wear the twelve-faced Rudrākṣa on the hair of the head. All the twelve Ādityas (suns) are present therein.
english translation
dvAdazAsyaM tu rudrA kSaM dhArayetkezadezake । AdityAzcaiva te sarvedvAdazaiva sthitAstathA 78 ।
hk transliteration by Sanscript