Śatapatha Brāhmaṇa ("of a hundred paths") 5.1.5.2

5.1.5.2

atha yadi rājanyo yajate | devasyāhaṃ savituḥ save satyasavasa indrasyottamaṃ nākaṃ ruheyamiti kṣatraṃ hīndraṃ kṣatraṃ rājanyaḥ

The Brahman mounts a cart-wheel, set up on (a post) as high as his navel, with (Vâg. S. IX, 10), 'At the impulse (sava) of the god Savitri, of true impulsion, may I ascend unto the highest heaven of Brihaspati!' thus, if a Brâhmana sacrifices; for Brihaspati is the Brahman (priesthood, or sanctity), and the Brâhmana is the Brahman.