Shiva Purana
शिरसीशानमंत्रेण कर्णे तत्पुरुषेण च । अघोरेण गले धार्यं तेनैव हृदयेपि च 1-25-४० ।
It shall be worn on the head repeating Īśāna mantra; on the ears with Tripuruṣa mantra; round the neck with Aghora mantra and on the chest also likewise.
english translation
zirasIzAnamaMtreNa karNe tatpuruSeNa ca । aghoreNa gale dhAryaM tenaiva hRdayepi ca 1-25-40 ।
hk transliteration by Sanscript