Hiranyakeshigrihyasutra 2.6.16.9

2.6.16.9

athopatiṣṭhate \ samīcī nāmāsi prācī dik \ ityetairmantraiḥ pratidiśam \9\

Then he worships the Serpents towards the different regions, one by one with (the corresponding section of) these Mantras, 'The convergent one thou art called, the eastern region' (Taitt. Samh. V, 5, 10, 1 seq.).