Shatapatha Brahmana 4.5.1.1

4.5.1.1

ādityena caruṇodayanīyena pracarati | tadyadādityaścarurbhavati yadevaināmado devā abruvaṃstavaiva prāyaṇīyastavodayanīya iti tamevāsyā etadubhayatra bhāgaṃ karoti

He proceeds with the rice-pap to Aditi, as the concluding oblation. The reason why there is a rice-pap for Aditi is this. Because, on that former occasion, the gods said to her, 'Thine forsooth shall be the opening, and thine the concluding oblation,' therefore he prepares that share for her at both ends (of the Soma-sacrifice).