Shiva Purana
इति जप्त्वा ततो ब्रूयान्मया कृत मिदं पुनः ॥ नान्दीमुखश्राद्धमिति यथोक्तं च वदेत्ततः ॥ ६५ ॥
After chanting this mantra he should then say I have done this again Then he should say that it is the shraddha of Nandimukha as mentioned above.
english translation
iti japtvA tato brUyAnmayA kRta midaM punaH ॥ nAndImukhazrAddhamiti yathoktaM ca vadettataH ॥ 65 ॥
hk transliteration by Sanscript