Shatapatha Brahmana 5.1.4.15

5.1.4.15

tamaśvānavaghrāpayati | vājina iti vājino hyaśvāstasmādāha vājina iti vājajita ityannaṃ vai vājo 'nnajita ityevaitadāha vājaṃ sariṣyanta ityājiṃ hi sariṣyanto bhavanti bṛhaspaterbhāgamavajighrateti bṛhaspaterhyeṣa bhāgo bhavati tasmādāha bṛhaspaterbhāgamavajighrateti tadyadaśvānavaghrāpayatīmamujjayānīti tasmādvā aśvānavaghrāpayati 5.1.5.tadyadājiṃ dhāvanti | imamevaitena lokamujjayatyatha yadbrahmā rathacakre sāma gāyati nābhidaghna uddhite 'ntarikṣalokamevaitenojjayatyatha yadyūpaṃ rohati devalokamevaitenojjayati tasmādvā etattrayaṃ kriyate

He makes the horses smell it, with 'Ye coursers--;' for horses are coursers (vâgin): therefore he says, 'Ye coursers,'--'wealth-winners,'--wealth is food: 'food-winners' he thereby says;--'starting upon the course;' for they are about to run a race;--'smell ye Brihaspati's portion!' for this indeed is Brihaspati's portion: therefore he says, 'smell ye Brihaspati's portion!' And why he makes the horses smell it: he thinks, 'may I win Him!' therefore he makes the horses smell it.