Śatapatha Brāhmaṇa ("of a hundred paths") 3.8.1.13

3.8.1.13

asya haviṣastmanā yajeti | vācamevaitadāhānārtasyāsya haviṣa ātmanā yajeti samasya tanvā bhaveti vācamevaitadāhānārtasyāsya haviṣastanvā sambhaveti

'Offer thou with the self of this oblation!' whereby he means to say to Speech, 'Offer thou with the soul of this unblemished oblation;'--'Unite thou with its body!' whereby he means to say to Speech, 'Unite thou with the body of this unblemished oblation!'