Shatapatha Brahmana 1.7.1.11

1.7.1.11

athokhāmādatte dyaurasi pṛthivyasītyupastautyevaināmetanyahayatyeva yadāha dyaurasi pṛthivyasīti mātariśvano gharmo 'sīti yajñamevaitatkaroti yathā gharmam pravṛñjyādevam pravṛṇakti viśvadhā asi parameṇa dhāmnā dṛṃhasva mā hvāriti dṛṃhatyevaināmetadaśithilāṃ karoti mā te yajñapatirhvārṣīditi yajamāno vai yajñapatistadyajamānāyaivaitadahvalāmāśāste

He puts the pot on (the Gârhapatya hearth), with the text (Vâg. S. I, 2 b, c): 'Thou art the sky! thou art the earth!'--he praises and eulogises her by thus saying, 'thou art the sky! thou art the earth!'--'Mâtarisvan's cauldron (gharma) art thou!' he thereby makes it (a means of) sacrifice, and puts it on just as if he were putting on the (pravargya-) cauldron (gharma).--'All-holding art thou! stand firm by the highest law! do not waver!'--thereby he steadies it, renders it firm.--'May thy Lord of Sacrifice not waver!'--the Lord of Sacrifice, doubtless, is the sacrificer, hence it is for the sacrificer that he thereby prays for steadiness.