Shatapatha Brahmana 8.7.3.7

8.7.3.7

indraṃ viśvā avīvṛdhanniti | indraṃ hi sarvāṇi bhūtāni vardhayanti samudravyacasaṃ gira iti mahimānamasyaitadāha rathītamaṃ rathīnāmiti rathitamo hyeṣa rathināṃ vājānāṃ satpatim patimityannaṃ vai vājā annānāṃ satpatim patimityetadaindryānuṣṭubhā nivapatyaindraṃ hi purīṣaṃ tadetadardhamagneryatpurīṣamardhamaiṣṭakam

[He scatters the loose soil, with, Vâg. S. XV, 56; Rig-veda I, 11, 1], 'They all have magnified Indra,'--for all beings, indeed, magnify Indra;--'the voices, him, of ocean-wide extent,'--he thereby alludes to his greatness;--'the foremost of charioteers,'--for of charioteers he is the greatest charioteer;--'the lordly lord of viands,'--viands mean food: thus, 'the lordly lord of food.' With this anushtubh verse addressed to Indra he scatters it; for the loose soil belongs to Indra: that (layer of) loose soil is one half of Agni (the fire-altar), the (other) half is the collection of bricks.