Śatapatha Brāhmaṇa ("of a hundred paths") 3.6.1.23

3.6.1.23

tadudīcīnavaṃśaṃ sado bhavati | prācīnavaṃśaṃ havirdhānametadvai devānāṃ niṣkevalyaṃ yaddhavirdhānaṃ tasmāttatra nāśnanti na bhakṣayanti niṣkevalyaṃ hyetaddevānāṃ sa yo ha tatrāśnīyādvā bhakṣayedvā mūrdhā hāsya vipatedathaite miśre yadāgnīdhraṃ ca sadaśca tasmāttayoraśnanti tasmādbhakṣayanti miśre hyete udīcī vai manuṣyāṇāṃ diktasmādudīcīnavaṃśaṃ sado bhavati

That Sadas has its tie-beams running (from south) to north, and the cart-shed (from west) to east. For this, the cart-shed, belongs exclusively to the gods: hence neither food nor drink is taken therein, because it belongs exclusively to the gods; and were any one either to eat or to drink therein, his head would verily burst asunder. But those two, the Âgnîdhra and the Sadas, are common (to the gods and men): hence food and drink is taken in these two, because they are common (to the gods and men). Now the north is the quarter of men: therefore the Sadas has its tie-beams running (from south) to north.