Shiva Purana
अतः परं न्यस्तकरो भस्मादाय स्वहस्ततः ॥ दद्याच्छिष्याय मूलेन रुद्राक्षं चाभिमंत्रितम् ॥ ७१ ॥
Then after performing the rite of Karanyāsa the preceptor shall take the Bhasma with his own hand and hand it over to the disciple along with the Mūlamantra and the Rudrākṣa over which the mantra has been repeated.
english translation
ataH paraM nyastakaro bhasmAdAya svahastataH ॥ dadyAcchiSyAya mUlena rudrAkSaM cAbhimaMtritam ॥ 71 ॥
hk transliteration by Sanscript