Śatapatha Brāhmaṇa ("of a hundred paths") 3.6.2.2

3.6.2.2

divi vai soma āsīta | atheha devāste devā akāmayantā naḥ somo gacettenāgatena yajemahīti ta ete māye asṛjanta suparṇīṃ ca kadrūṃ ca vāgeva suparṇīyaṃ kadrūstābhyāṃ samadaṃ cakruḥ

Now Soma was in heaven, and the gods were here on earth. The gods desired, 'Would that Soma might come to us; we might sacrifice with him, when come.' They produced those two illusions, Suparnî and Kadrû; Suparnî, forsooth, was Vâk (speech), and Kadrû was this (earth). They caused discord between them.