Śatapatha Brāhmaṇa ("of a hundred paths") 1.3.1.17

1.3.1.17

ūrdhvamevodgūhati | viṣṇorveṣyo 'sīti sā vai na paścātprācī devānāṃ yajñamanvāsīteyaṃ vai pṛthivyaditiḥ seyaṃ devānām patnī sā paścātprācī devānāṃ yajñamanvāste taddhemāmabhyārohetsā patnī kṣipre 'muṃ lokamiyāttatho ha patnī jyogjīvati tadasyā evaitannihnute tatho haināmiyaṃ na hinasti tasmādu dakṣiṇata ivaivānvāsīta

He twists it through upwards, with the text (Vâg. S. I, 30), 'The pervader, of Vishnu art thou!' Let her not sit to the west of the sacrifice, with her face towards the east. For Aditi is this earth, she is the wife of the gods, and she indeed sits on the west of the sacrifice of the gods, with her face turned towards the east: and this lady would, therefore, raise herself to her (Aditi), and would speedily go to yonder world. And thus (viz. by sitting in the prescribed way) she lives for a long time, thus she propitiates her (Aditi), and thus the latter harms her not. For this reason let her sit somewhat to the south.