Śatapatha Brāhmaṇa ("of a hundred paths") 4.4.2.1

4.4.2.1

saumyena caruṇā pracarati | somo vai devānāṃ havirathaitatsomāyaiva haviṣkriyate tathātaḥ somo 'nantarhito bhavati carurbhavati carurvai devānāmannamodano hi carurodano hi pratyakṣamannaṃ tasmāccarurbhavati

He proceeds with (the offering of) Soma's rice-pap; for Soma is the sacrificial food of the gods; and here now sacrificial food is prepared for Soma on his part; and thus Soma is not excluded therefrom. It is a rice-pap (karu), for rice-pap is food for the gods, since rice-pap is boiled rice, and boiled rice is clearly food: therefore it is a rice-pap.