Śatapatha Brāhmaṇa ("of a hundred paths") 14.3.2.27

14.3.2.27

darśapūrṇamāsau vai pravargyaḥ sarvam vai darśapūrṇamāsau sarvam pravargyaḥ sa yadadhiśritaṃ tatpravṛkto yadāsannaṃ tadrucito yaddhutaṃ tatpinvito yadā vai darśapūrṇamāsau pinvete athainau sarve devāḥ sarvāṇi bhūtānyupajīvanti pinvete ha vā asmai darśapūrṇamāsau ya evametadveda

The Pravargya, indeed, is the New and Full-moon sacrifices; for the New and Full-moon sacrifices are everything, and the Pravargya is everything: when it (the havis) is put on the fire then it is the (Gharma) placed thereon; when it is standing ready then it is the burning-hot (Gharma); and when it is offered then it is the overflowing (Gharma); but, indeed, when the New and Full-moon sacrifices overflow all the gods and all beings subsist thereon; and, verily, the New and Full-moon sacrifices overflow for him who thus knows this.