Agniveshyagrihyasutra 1.2.2.7

1.2.2.7

nivītina uttarata udīcīnapravaṇa udagagrairdarbhaiḥ prāgapavargāṇyāsanāni kalpayanti viśvāmitrāya jamadagnaye bharadvājāya gautamāyātraye vasiṣṭhāya kāśyapāya \

Wearing the sacred thread around the neck, to the north, on [ground] sloping to the north, they arrange seats ending in the east with darbha blades whose tips point to the north, for Viśvāmitra, Jamadagni, Bharadvāja, Gautama, Atri, Vasiṣṭha, and Kaśyapa.