Shatapatha Brahmana 11.1.6.35

11.1.6.35

tā vā etāḥ anapoddhāryā āhutayo bhavanti sa yaddhaitāsāmapoddharedyathaikamaṅgaṃ śṛṇīyātprāṇaṃ vā nirhaṇyādevaṃ tadanyānyeva havīṃṣyupa cāhriyante'pa ca hriyante

Now, these are offerings from which nothing must be omitted; but were one to omit anything of them, it would be as if he were to break off some limb, or knock out some (channel of the) vital air. Other oblations, indeed, are either added to or omitted.