Shiva Purana
ततः शाक्तं च संदिश्य मन्त्रं मन्त्रविचक्षणः ॥ उच्चारयित्वा च सुखं तस्मै मंगलमादिशेत् ॥ ६५ ॥
Then after instructing him in the Śakti mantra, the expert preceptor shall make him repeat it easily and bless him with auspiciousness.
english translation
tataH zAktaM ca saMdizya mantraM mantravicakSaNaH ॥ uccArayitvA ca sukhaM tasmai maMgalamAdizet ॥ 65 ॥
hk transliteration by Sanscript