Śatapatha Brāhmaṇa ("of a hundred paths") 5.2.2.15

5.2.2.15

athāha | samrāḍayamasau samrāḍayamasāviti niveditamevainametatsantaṃ devebhyo nivedayatyayam mahāvīryo yo 'bhyaṣecītyayaṃ yuṣmākaiko 'bhūttaṃ gopāyatetyevaitadāha triṣkṛtva āha trivṛddhi yajñaḥ

He then says,' All-ruler is he, N.N.! All-ruler is he, N.N.!' Him, thus indicated, he thereby indicates to the gods: 'Of mighty power is he who has been consecrated; he has become one of yours; protect him!' thus he thereby says. Thrice he says it, for threefold is the sacrifice.