Shiva Purana
कृत्वानुचिन्त्य तद्व्याप्तिं वागीशां च यथाक्रमम् ॥ दीप्ताग्नौ पूर्णहोमान्तं कृत्वा शेषं च पूर्ववत् ॥ २७ ॥
After carefully considering the extent of the Vedic literature, the Lord of the Vedas gradually described it. After completing the complete sacrifice in a burning fire the rest should be done as before.
english translation
kRtvAnucintya tadvyAptiM vAgIzAM ca yathAkramam ॥ dIptAgnau pUrNahomAntaM kRtvA zeSaM ca pUrvavat ॥ 27 ॥
hk transliteration by Sanscript