Śatapatha Brāhmaṇa ("of a hundred paths") 5.3.3.8

5.3.3.8

atha mitrāya satyāya | nāmbānāṃ caruṃ nirvapati tadenam mitra eva satyo brahmaṇe suvatyatha yannāmbānām bhavati varuṇyā vā etā oṣadhayo yāḥ kṛṣṭe jāyante 'thaite maitrā yannāmbāstasmānnāmbānām bhavati

For Mitra Satya (the True) he then prepares a pap of Nâmba seed: thereby Mitra the True quickens him for the Brahman. And as to its being prepared of Nâmba seed,--to Varuna, no doubt, belong those plants which grow in ploughed ground; but those, the Nâmba plants, belong to Mitra: therefore it is (prepared) of Nâmba seed.