Śatapatha Brāhmaṇa ("of a hundred paths") 4.1.3.15

4.1.3.15

tasya vā etasya grahasya | dve purorucau vāyavyaiva eva pūrva aindravāyava uttaro dve anuvākye vāyavyaiva pūrvaindravāyavyuttarā dvau praiṣau vāyavya eva pūrva aindravāyava uttaro dve yājye vāyavyaiva pūrvaindravāyavyuttaraivamenaṃ turīyaṃ turīyameva bhājayāṃ cakāra

Now with this libation there are two puroruk --formulas,--the first belonging to Vâyu alone, and the second to Indra and Vâyu; and two invitatory prayers (anuvâkyâ),--the, first to Vâyu alone, and the second to Indra and Vâyu; and two praisha (directions),--the first belonging to Vâyu alone, and the second to Indra and Vâyu; and two offering prayers (yâgyâ),--the first to Vâyu alone, and the second to Indra and Vâyu: thus he assigns to him (Indra) each time a fourth part for his share.