Shiva Purana
मांत्री क्रियावती दीक्षा कुंडमंडलपूर्विका ॥ मंदमंदतरोद्देशात्कर्तव्या गुरुणा बहिः ॥ ११ ॥
The Mantra form of initiation is coupled with the rites performed in the sacrificial altar. This has to be performed by the preceptor (guru) externally with respect to the dull-witted disciple.
english translation
mAMtrI kriyAvatI dIkSA kuMDamaMDalapUrvikA ॥ maMdamaMdataroddezAtkartavyA guruNA bahiH ॥ 11 ॥
hk transliteration by Sanscript