Śatapatha Brāhmaṇa ("of a hundred paths") 3.8.2.2

3.8.2.2

tāṃ vācayati | namasta ātāneti yajño vā ātāno yajñaṃ hi tanvate tena yajña ātāno jaghanārdho vā eṣa yajñasya yatpatnī tāmetatprācīṃ yajñam prasādayiṣyanbhavati tasmā evaitadyajñāya nihnute tatho haināmeṣa yajño na hinasti tasmādāha namasta ātāneti

He makes her say (Vâg. S. VI, 12), 'Homage be to thee, O wide-stretched!'--the wide-stretched one, forsooth, is the sacrifice; for they stretch the sacrifice (over the sacrificial ground): hence the wide-stretched one is the sacrifice. But that wife, forsooth, is the hind-part of the sacrifice, and he wants her, thus coming forward, to propitiate the sacrifice. Thereby, then, she makes amends to that sacrifice, and thus that sacrifice does not injure her: therefore she says, 'Homage be to thee, O wide-stretched!'