Śatapatha Brāhmaṇa ("of a hundred paths") 3.7.2.5

3.7.2.5

sa ya uttaro 'gniṣṭhātsyāt | tamevāgra ucrayedatha dakṣiṇamathottaraṃ dakṣiṇārdhyamuttamaṃ tathodīcī bhavati

Let him first set up that (stake) which stands (immediately) north of the one opposite the fire, then the one on the south, then a northern one,--last of all the one on the southern flank: thus it (the row of stakes) inclines to the north.