Śatapatha Brāhmaṇa ("of a hundred paths") 4.5.1.16

4.5.1.16

atho caturgṛhītamevājyaṃ gṛhītvā | vaiṣṇavyarcā juhotyuru viṣṇo vikramasvoru kṣayāya naskṛdhi ghṛtaṃ ghṛtayone piba pra-pra yajñapatiṃ tira svāheti yajño vai viṣṇustadyajñamevaitatpunarārabhate tathāsyāyātayāmā yajño bhavati tatho asmānna parāṅ bhavati tatro yacaknuyāttaddadyānnādakṣiṇaṃ haviḥ syāditi hyāhuratha yadevaiṣodavasānīyeṣṭiḥ saṃtiṣṭhate 'tha sāyamāhutiṃ juhoti kāla eva prātarāhutim

Or, he takes ghee in five ladlings, and offers it with the verse to Vishnu (Vâg. S. V, 38), 'Stride thou widely, O Vishnu, make wide room for our abode! drink the ghee, thou born of ghee, and speed the lord of the sacrifice ever onwards, Hail!' For Vishnu is the sacrifice: he thus takes hold again of the sacrifice, and thus his sacrifice is not exhausted in strength, and does not pass away from him. And let him on this occasion give as much as he can afford, for no offering, they say, should be without a Dakshinâ. When this Udavasânîyâ-ishti is completed, he offers the (ordinary) evening (milk) offering,--but the morning offering at its proper time.