Shatapatha Brahmana 14.2.2.7

14.2.2.7

indrāya tvādityavate svāheti ayam vā indro yo'yam pavate tasmā evainaṃ juhoti tasmādāhendrāya tvetyādityavata iti tadindramevānvādityānābhajatyatho tṛtīyasavanasyaivaitadrūpaṃ kriyate

'To Indra, accompanied by the Âdityas,--thee, hail!'--Indra indeed is he who blows here: it is to him he thus offers it, and therefore he says, 'To Indra--thee;' and when he says, 'accompanied by the Âdityas,' thereby he allows a share to the Âdityas along with Indra; and, moreover, it is made like the evening-pressing.