Śatapatha Brāhmaṇa ("of a hundred paths") 4.4.2.6

4.4.2.6

athāparaṃ caturgṛhītamājyaṃ gṛhītvā | āśrāvyāha ghṛtasya yajeti vaṣaṭkṛte juhoti tadyā ata ūrdhvā āhutīrhoṣyanbhavati tābhya evaitadantardadhāti tathā hāsamadaṃ karoti sa yadi kāmayetobhayataḥ pariyajedyadyu kāmayetānyatarataḥ pariyajet

He then takes ghee a second time by four ladlings, and having called for the Sraushat, he says, 'Recite the offering prayer of the ghee!' and offers as the Vashat is uttered. From whatever oblations he intends to offer hereafter, he thereby separates this one (to Soma), and thus he causes no discord. If he chooses, he may offer (ghee) on both sides (before and after the Soma's rice-pap); or, if he chooses, he may offer on one side only.