Shatapatha Brahmana 9.4.1.14

9.4.1.14

śīrṣataḥ | śīrṣato vā abhiṣicyamāno 'bhiṣicyata upari dhāryamāṇa upari hi sa yametadabhiṣiñcati samānena mantreṇa samāto hi sa yametadabhiṣiñcati sarvataḥ parihāraṃ sarvata evainametadabhiṣiñcati

On the head (or front part of the chariot the offering is made), for it is from the head (downwards) that he who is anointed is anointed,--whilst it is held above (the Âhavanîya), for above (others) is he who is thus anointed;--with the same formula (repeated each time), for one and the same (person) is he who is thus anointed;--whilst taking round (the chariot-head) in every direction: on every side he thus is anointed.