Śatapatha Brāhmaṇa ("of a hundred paths") 4.2.2.5

4.2.2.5

sa yadi rājopadasyet | tamata eva tanvīrannataḥ prabhāvayeyurātmā vā āgrayaṇa ātmano vā imāni sarvāṇyaṅgāni prabhavantyetasmādantato hāriyojanaṃ grahaṃ gṛhṇāti tadātmanyevāsyām pratiṣṭhāyāmantato yajñaḥ pratitiṣṭhati

And if the king (Soma) become exhausted, they extend him from out of that (bowl), make him issue therefrom; for the Âgrayana is the body, and from the body all these limbs issue. Therefrom they draw at the end the Hâriyogana cup: whereby the sacrifice is established at the end in this resting-place, the body (or its own self).