Shiva Purana
विष्ण्वादिदेवभक्ताश्च धारयेयुर्न संशयः । रुद्र भक्तो विशेषेण रुद्रा क्षान्धारयेत्सदा ६२ ।
Even the devotees of Viṣṇu and other deities shall unhesitatingly wear the Rudrākṣa. Especially the devotee of Rudra shall wear Rudrākṣas always.
english translation
viSNvAdidevabhaktAzca dhArayeyurna saMzayaH । rudra bhakto vizeSeNa rudrA kSAndhArayetsadA 62 ।
hk transliteration by Sanscript