Shiva Purana
अथवा मंत्रसंस्कारमनुचिंत्याखिलं क्रमात् ॥ अध्वशुद्धिं गुरुः कुर्यादभिषेकावसानिकम् ॥ २५ ॥
Or beginning with the consecration of the Mantra and concluding with the rite of Abhiṣeka the rites of the purification of the path shall be performed by the preceptor.
english translation
athavA maMtrasaMskAramanuciMtyAkhilaM kramAt ॥ adhvazuddhiM guruH kuryAdabhiSekAvasAnikam ॥ 25 ॥
hk transliteration by Sanscript