Shatapatha Brahmana 9.5.1.66

9.5.1.66

kāmamvevainaṃ sa cinvīta | yaḥ saṃvatsaramabhiṣaviṣyantsyādeṣa vā enaṃ pratyakṣamannena bibhartyetābhirāhutibhiḥ

And, indeed, let him by all means build who intends to press Soma for a year, for he, manifestly, supports him by food (in the shape of) those libations.