Shiva Purana
एवं कृत्वा निवृत्त्यन्तं शांत्यतीतमनुक्रमात् ॥ हुत्वाहुतित्रयं पश्चान्मण्डले च शिवं यजेत् ॥ ३२ ॥
In this manner after offering the Āhutis of Śāntyatīta upto the end of Nivṛtti he shall perform three Āhutis and worship Śiva in the Maṇḍala.
english translation
evaM kRtvA nivRttyantaM zAMtyatItamanukramAt ॥ hutvAhutitrayaM pazcAnmaNDale ca zivaM yajet ॥ 32 ॥
hk transliteration by Sanscript