Śatapatha Brāhmaṇa ("of a hundred paths") 1.7.3.20

1.7.3.20

sa vā uttarārdhādavadyati | uttarārdhe juhotyeṣā hyetasya devasya diktasmāduttarārdhādavadyatyuttarārdhe juhotyetasyai vai diśa udapadyata taṃ tata evāśamayaṃstasmāduttarārdhādavadyatyuttarārdhe juhoti

He cuts (the portions for Agni Svishtakrit) from the north part (of the sacrificial dishes), and offers them up on the north part (of the fire): for this is the region of that god, and therefore he cuts from the north part and offers on the north part. From that side, indeed, he arose, and there they (the gods) appeased him: for this reason he cuts from the north part, and offers on the north part.