Śatapatha Brāhmaṇa ("of a hundred paths") 9.3.4.13

9.3.4.13

uttarata evainabhiṣiñcet | eṣā hobhayeṣāṃ devamanuṣyāṇāṃ digyadudīcī prācī svāyāmevainametaddiśyāyattam pratiṣṭhitamabhiṣiñcati na vai sva āyatane pratiṣṭhito riṣyati

Let him anoint him on the left (north) side and nowhere else, for that north-eastern region belongs to both gods and men: they thus anoint him whilst seated and established in his own region, for he who is established in his own seat suffers no injury.