Śatapatha Brāhmaṇa ("of a hundred paths") 13.4.3.2

13.4.3.2

samupaviṣṭeṣvadhvaryuḥ sampreṣyati hotarbhūtānyācakṣva bhūteṣvimaṃ yajamānamadhyūheti sampraiṣito hotādhvaryumāmantrayate pāriplavamākhyānamākhyāsyannadhvaryaviti havai hotarityadhvaryuḥ

When they are seated together, the Adhvaryu calls upon (the Hotri), saying, 'Hotri, recount the beings: raise thou this Sacrificer above the beings!' Thus called upon, the Hotri, being about to tell the Pâriplava Legend, addresses (the Adhvaryu), 'Adhvaryu!'--'Havai hotar!' replies the Adhvaryu.