Śatapatha Brāhmaṇa ("of a hundred paths") 4.1.2.6

4.1.2.6

tadyadupayāmena grahā gṛhyante | iyaṃ vā aditistasyā adaḥ prāyaṇīyaṃ havirasāvādityaścarustadvai tatpureva sutyāyai sā heyaṃ deveṣu sutyāyāmapitvamīṣe 'stveva me 'pi prasute bhāga iti

Then as to why the grahas are drawn with the Upayâma. Now Aditi is this (earth), and hers was that prâyanîya oblation, that Âditya rice-pap. But that was, as it were, previous to the Soma feast: she desired to have a share along with the gods in the Soma feast, and said, 'Let there be for me also a share of the pressed Soma!'