Shiva Purana
शिष्यं शिरसि संताड्य सूत्रं देहे यथाक्रमम् ॥ शांत्यतीतपदे सूत्रं लाञ्छयेन्मंत्रमुच्चरन् ॥ ३१ ॥
After striking the disciple on the head and the thread worne on the body he shall bedeck the sūtra in the Śāntyatīta Pada, repeating the mantra.
english translation
ziSyaM zirasi saMtADya sUtraM dehe yathAkramam ॥ zAMtyatItapade sUtraM lAJchayenmaMtramuccaran ॥ 31 ॥
hk transliteration by Sanscript