Shiva Purana
हुत्वा पूर्णाहुतिं वह्नौ ब्रह्माणं पूजयेत्ततः ॥ हुत्वाहुतित्रयं तस्मै शिवाज्ञामनुसंदिशेत् ॥ १८ ॥
After making the Pūrṇāhuti in the fire he shall worship Brahmā. After performing three Āhutis for him he shall submit to him the behest of Śiva.
english translation
hutvA pUrNAhutiM vahnau brahmANaM pUjayettataH ॥ hutvAhutitrayaM tasmai zivAjJAmanusaMdizet ॥ 18 ॥
hk transliteration by Sanscript