Śatapatha Brāhmaṇa ("of a hundred paths") 3.4.4.13

3.4.4.13

atha yadupabhṛtyājyam bhavati | tatsamānayamāna āha viṣṇave 'nubrūhītyāśrāvyāha viṣṇuṃ yajeti vaṣaṭkṛte juhoti

Thereupon, while pouring the ghee which is in the upabhrit, together (with what is left in the guhû), he says, 'Recite the invitatory prayer to Vishnu!' and, having called for the Sraushat, he says, 'Pronounce the offering prayer to Vishnu!' and pours out the oblation when the Vashat is uttered.