Shiva Purana
संधाने युगपत्पूजां कृत्वा हुत्वाहुतित्रयम् ॥ शिष्यात्मनः प्रतिष्ठायां प्रवेशं त्वथ भावयेत् ॥ २३ ॥
Performing the worship and the three Āhutis simultaneously he shall imagine the entry of the Ātman of the disciple into the Pratiṣṭhā Kalā.
english translation
saMdhAne yugapatpUjAM kRtvA hutvAhutitrayam ॥ ziSyAtmanaH pratiSThAyAM pravezaM tvatha bhAvayet ॥ 23 ॥
hk transliteration by Sanscript