Shatapatha Brahmana 6.5.2.15

6.5.2.15

tā etā aitasyai bhavanti | etadvā etā etāmastabhnuvastathaivaināmetatstabhnuvanti tadyadata ūrdhvaṃ tadetayā tiraścyā dṛḍhamatha yadato 'rvāktadetābhiḥ

These (vertical bands) run up to (the rim of) it, for they did then support it, and so do they now support it: thus that upper part of it becomes firm by means of the horizontal belt, and that lower part of it by means of these (vertical bands).