Śatapatha Brāhmaṇa ("of a hundred paths") 5.3.3.5

5.3.3.5

atha bṛhaspataye vāce | naivāraṃ caruṃ nirvapati tadenam bṛhaspatireva vāce suvatyatha yannaivāro bhavati brahma vai bṛhaspatirete vai brahmaṇā pacyante yannīvārāstasmānnaivāro bhavati

For Brihaspati Vâk (speech) he then prepares a pap of wild rice: thereby Brihaspati quickens him for speech. And as to its being prepared of wild rice,--Brihaspati is the Brahman, and they, the wild rice-plants, are ripened by the Brahman: hence it is prepared of wild rice.