Gobhilagrihyasutra 2.6.2

2.6.2

prātaḥ saśiraskā ''pluto 'dagagreṣu darbheṣu, paścād agner udagagreṣu darbheṣu prācy upaviśati;

In the morning, after she has been washed, sitting on northward-pointed Darbha grass, (all over her body) including her head, she sits down to the west of the fire on northward-pointed Darbha grass, facing the east.