Śatapatha Brāhmaṇa ("of a hundred paths") 3.8.2.23

3.8.2.23

athāha pratiprasthātā śṛtā pracareti | srucāvādāyādhvaryuratikramyāśrāvyāha svāhākṛtibhyaḥ preṣyeti vaṣaṭkṛte juhoti

The Pratiprasthâtri says, 'It is roasted: proceed!' The Adhvaryu, having taken the two spoons and stept across (to the north side of the fire) and called for the Sraushat, says (to the Maitrâvaruna), 'Prompt for the Svâhâs!' and offers (the ghee) when the Vashat has been pronounced.