Śatapatha Brāhmaṇa ("of a hundred paths") 5.5.1.2

5.5.1.2

tadyadetena rājasūyayājī yajate | yadevainaṃ diśaḥ samārohayati yadṛtūnyatstomānyaccandāṃsi tasmādevainametena niṣkrīṇāti sa yaddhaitena rājasūyayājī na yajetodvā ha mādyetpra vā patettasmādvā etena rājasūyayājī yajate

And as to why the performer of the Râgasûya should perform this offering: because he (the priest) makes him ascend the regions, the seasons, the hymns and metres, he now redeems him therefrom by this (offering). But were the performer of the Râgasûya not to perform this offering, then verily he would become intoxicated (with pride) and would fall down headlong: that is why the performer of the Râgasûya performs this offering.