Śatapatha Brāhmaṇa ("of a hundred paths") 4.1.3.14

4.1.3.14

tau prajāpatim pratipraśnameyatuḥ | sa prajāpatirgrahaṃ dvedhā cakāra sa hovācedaṃ vāyorityatha punarardhaṃ dvedhā cakāra sa hovācedaṃ vāyoritīdaṃ tavetīndra turīyameva bhājayāṃ cakāra yadvai caturthaṃ tatturīyaṃ tata eṣa aindraturīyo graho 'bhavat

They went to Pragâpati for his decision. Pragâpati divided the cup (of Soma) into two parts and said, 'This (half) is Vâyu's!' Then he divided the (other) half into two parts and said, 'This is Vâyu's!--This is thine!' then he assigned to Indra a fourth part for his share--one fourth is the same as a quarter: henceforward that cup belonged, one fourth of it, to Indra.