Śatapatha Brāhmaṇa ("of a hundred paths") 1.6.3.26

1.6.3.26

tadu hovācāsuriḥ | ājyabhāgābhyāmevāto yatame vā yatame vā dve āpnotyupāṃśuyājenaivāto 'horātre āpnoti puroḍāśenaivāto 'rdhamāsāvāpnoti sarvaṃ ma āptamasatsarvaṃ jitaṃ sarveṇa vṛtraṃ hanāni sarveṇa dviṣantaṃ bhrātṛvyaṃ hanānīti tasmādvā etāvatkriyata iti

Âsuri, on the other hand, said: 'By means of the two butter-portions he gains any two (of those objects); by means of the low-voiced offering he obtains any (other) two; and by means of the rice-cake he obtains any (other) two: "all has been obtained, all has been conquered by me! with that All I will slay Vritra; with the All I will slay the spiteful enemy!" thus he thinks, and for that reason there is this manifold performance.'