Śatapatha Brāhmaṇa ("of a hundred paths") 14.1.2.9

14.1.2.9

atha mṛtpiṇḍam pavrigṛhṇāti abhryā ca dakṣiṇato hastena ca hastenaivottarato devī dyāvāpṛthivī iti yajñasya śīrṣacinnasya raso vyakṣaratsa ime dyāvāpṛthivī agacadyanmṛdiyaṃ tadyadāpo'sau tanmṛdaścāpāṃ ca mahāvīrāḥ kṛtā bhavanti tenaivainametadrasena samardhayati kṛtsnaṃ karoti tasmādāha devī dyāvāpṛthivī iti makhasya vāmadya śiro rādhyāsamiti yajño vai makho yajñasya vāmadya śiro rādhyāsamityevaitadāha devayajane pṛthivyā iti devayajane hi pṛthivyai sambharati makhāya tvā makhasya tvā śīrṣṇa iti yajño vai makho yajñāya tvā yajñasya tvā śīrṣṇa ityevaitadāha

He then takes the lump of clay with the (right) hand and spade on the right (south) side, and with the (left) hand alone on the left (north) side, with (Vâg. S. XXXVII, 3), 'O divine Heaven and Earth,'--for when the sacrifice had its head cut off, its sap flowed away, and entered the sky and the earth: what clay (firm matter) there was that is this (earth), and what water there was that is yonder (sky); hence it is of clay and water that the Mahâvîra (vessels) are made: he thus supplies and completes it (the Pravargya) with that sap; wherefore he says, 'O divine Heaven and Earth,'--'May I this day compass for you Makha's head,'--Makha being the sacrifice, he thus says, 'May I this day accomplish for you the head of the sacrifice;'--'on the Earth's place of divine worship,'--for on a place of divine worship of the earth he prepares it;--'for Makha thee! for Makha's head thee!'--Makha being the sacrifice, he thus says, 'For the sacrifice (I consecrate) thee, for the head of the sacrifice (I consecrate) thee.'