Śatapatha Brāhmaṇa ("of a hundred paths") 6.2.1.8

6.2.1.8

sa aikṣata | yamimamātmānamapsu prāpiplavaṃ tamanvicānīti tamanvaicattadyadeṣāmapsu praviddhānām pratyatiṣṭhattā apaḥ samabharadatha yadasyāṃ tām mṛdaṃ tadubhayaṃ sambhṛtya mṛdaṃ cāpaśceṣṭakāmakarokṣasmādetadubhayamiṣṭakā bhavati mṛccāpaśca

He considered, 'I must search for that body which I let float on the water.' He searched for it; and what (part) of those (bodies) cast into the water had settled therein, that water he gathered; and what (had settled) in this earth, that clay (he gathered). And having gathered both that clay and water, he made a brick: hence a brick consists of these two, clay and water.