Śatapatha Brāhmaṇa ("of a hundred paths") 7.3.1.4

7.3.1.4

rājānaṃ krītvā paryuhya | athāsmā ātithyaṃ havirnirvapati tasya haviṣkṛtā vācaṃ visṛjate 'tha vā etadvyatiṣajatyadhvarakarma cāgnikarma ca karmaṇaḥ samānatāyai samānamidaṃ karmāsaditi

Having bought the king, and driven him about, he then takes out the material for the guest-meal. With the Havishkrit of that (ceremony) he releases speech. And in this way he interlinks the performance of the (Soma) sacrifice and the performance of the fire (altar) for the purpose of unity of performance, thinking, 'Uniform shall be this performance!'