Shatapatha Brahmana 6.7.1.15

6.7.1.15

catuḥsraktayaḥ pādā bavanti | catuḥsraktīnyanūcyāni catasro vai diśo diśo vā etaṃ yantumarhanti digbhiretaṃ devā abibharurdigbhirevainametadbibharti mauñjībhī rajjubhirvyutā bhavati trivṛdbhistasyokto bandhurmṛdā digdhā tasyo evokto 'tho anatidāhāya

The feet and boards are four-cornered; for there are four regions, and the regions are able to sustain him: by means of the regions the gods bore him, and by the regions does he now bear him. It is interwoven with cords of reed-grass, triple ones,--the significance of this has been explained;--and smeared over with clay,--(the significance) of this also has been explained; but it also serves to keep them from taking fire.