Śatapatha Brāhmaṇa ("of a hundred paths") 11.2.4.5

11.2.4.5

athādhyātmam udāna eva pūrṇamā udānena hyayam puruṣaḥ pūryata iva prāṇa eva darśo dadṛśa iva hyayam prāṇastadetāvannādaścānnapradaśca darśapūrṇamāsau

Then as to the body. The full moon is the up-breathing, for it is by the up-breathing that this man is, as it were, filled; and the new moon is the out (and in)-breathing, for this out-breathing appears, as it were: thus, the full and new moon are these two, the eater and the giver of food.