Shatapatha Brahmana 7.1.1.25

7.1.1.25

purīṣyāso agnaya iti | paśavyāso 'gnaya ityetatprāvaṇebhiḥ sajoṣasa iti prāyaṇarūpam prāyaṇaṃ hyetadagneryadgārhapatyo juṣantāṃ yajñamadruho 'namīvā iṣo mahīriti juṣantāṃ yajñamadruho 'naśanāyā iṣo mahīrityetat

[The fourth one, with Vâg. S. XII, 50] 'The Agnis Purîshyas,'--that is, the Agnis favourable to cattle; 'together with those of the streams (prâvana);' this is a form of starting (prâyana), for the Gârhapatya is indeed a starting of the fire;--'may they, benevolent, accept the sacrifice, the copious, salutary draughts!' that is, 'may they benevolently accept the sacrifice, the copious, innocuous draughts!'