Devibhagavatapurana 3.13.34

3.13.34

citiñca kārayāmāsa vedīścaiva suvistarāḥ |
prajepurbrāhmaṇā mantrāndevyā bījasamanvitān ||

When the big altar and chiti (pile of wood for burning, stack of sacrificial bricks) were finished, the Brâhmanas began to recite slowly the Devî mantrams with their root mantrams.
Note:-- Chiti, lit pile of wood for burning, is perhaps the Mûlâdhâra, the sacral plexus, where the fire called Kundalinî is first kindled by processes of Yoga.