Shiva Purana
त्रयोदशमुखो विश्वेदेवस्तद्धारणान्नरः । सर्वान्कामानवाप्नोति सौभाग्यं मंगलंलभेत् ७९ ।
A Rudrākṣa with thirteen faces is Viśvedeva. By wearing it, a man will attain the realisation of all desires. He will derive good fortune and auspiciousness.
english translation
trayodazamukho vizvedevastaddhAraNAnnaraH । sarvAnkAmAnavApnoti saubhAgyaM maMgalaMlabhet 79 ।
hk transliteration by Sanscript