Śatapatha Brāhmaṇa ("of a hundred paths") 3.2.4.20

3.2.4.20

indrāyādhyakṣāyeti | svadhyakṣāsadityevaitadāha yadāhendrāyādhyakṣāyetyanu mātā manyatāmanu pitānu bhrātā sagarbhyo 'nu sakhā sayūthya iti sā yatte janma tena no 'numatā somamacehītyevaitadāha sā devi devamacehīti devī hyeṣā devamacaiti yadvākṣomaṃ tasmādāha sā devi devamacehītīndrāya somamitīndro vai yajñasya devatā tasmādāhendrāya somamiti rudrastvāvartayatvityapraṇāśāyaitadāha rudr aṃ hi nāti paśavaḥ svasti somasakhā punarehīti svasti naḥ somena saha punarehītyevaitadāha

'For Indra as the supreme guide;'--whereby he says, 'May she be well-guarded!' [He proceeds, Vâg. S. IV, 20], 'May thy mother grant thee permission, thy father, thine own brother, thy fellow in the herd!' whereby he says, 'Go thou for us to fetch Soma, with the permission of all thy kin.'--'O goddess, go to the god,'--for it is indeed as a goddess, as Vâk, that she goes to a god, to Soma: therefore he says, 'O goddess, go to the god;'--'To Soma for the sake of Indra!' Indra truly is the deity of the sacrifice: therefore he says, 'To Soma for the sake of Indra.' 'May Rudra guide thee back!' this he says for her safety, for cattle cannot pass beyond Rudra. 'Hail to thee! come back, with Soma for thy companion!' whereby he says, 'Hail to thee, come back to us together with Soma!'