Agniveshyagrihyasutra 1.2.2.11

1.2.2.11

dakṣiṇataḥ prācīnāvītino dakṣiṇāpravaṇe dakṣiṇāgrairdarbhaiḥ pratyagapavargāṇyāsanāni kalpayanti \

To the south, wearing the sacred thread over the right shoulder, on [ground] sloping to the south, they arrange seats ending in the west with darbha blades whose tips point to the south,