Śatapatha Brāhmaṇa ("of a hundred paths") 11.1.3.1

11.1.3.1

paurṇamāseneṣṭvā indrāya vimṛdhe'nunirvapati tena yatheṣṭyaivaṃ yajata āmāvāsyeneṣṭvādityai carumanunirvapati tena yatheṣṭyaivaṃ yajate

When he has performed the Full-moon sacrifice, he prepares an additional (cake) for Indra Vimridh (the repeller of scorners), and offers it in accordance with the procedure of an ishti; and when he has performed the New-moon sacrifice, he prepares an additional rice-pap for Aditi, and offers it in accordance with the procedure of an ishti.