Śatapatha Brāhmaṇa ("of a hundred paths") 13.5.4.24

13.5.4.24

athāto dakṣiṇānām madhyam prati rāṣṭrasya yadanyadbhūmeśca puruṣebhyaśca brāhmaṇasya ca vittātprācī digghoturdakṣiṇā brahmaṇaḥ pratīcyadhvaryorudīcyudgātustadeva hotṛkā anvābhaktāḥ

Now as to the sacrificial gifts. Whatever there is towards the middle of the kingdom other than the land, the men, and the property of the Brâhmana, of that the eastern region belongs to the Hotri, the southern to the Brahman, the western to the Adhvaryu, the northern to the Udgâtri; and the Hotrikas share this along with them.