Śatapatha Brāhmaṇa ("of a hundred paths") 5.3.5.18

5.3.5.18

somasya dātramasīti | yadā vā enametābhirabhiṣuṇvantyathāhutirbhavati tasmādāha somasya dātramasīti svāhā rājasva iti tadenāḥ svāhākāreṇaivotpunāti

'Soma's portion thou art;' for when they consecrate him with those (waters), then there is an oblation: therefore he says 'Soma's portion thou art;'--'Hail, spiriters of kings!'--it is with 'Hail' that he thus purifies them.