Śatapatha Brāhmaṇa ("of a hundred paths") 6.1.2.12

6.1.2.12

sa prajāḥ sṛṣṭvā | sarvamājimitvā vyasraṃsata tasmādu haitadyaḥ sarvamājimeti vyeva sraṃsate tasmādvisrastātprāṇo madhyata udakrāmattasminnenamutkrānte devā ajahuḥ

Having created creatures he, having run the whole race, became relaxed; and therefore even now he who runs the whole race becomes indeed relaxed. From him being thus relaxed, the vital air went out from within. When it had gone out of him the gods left him.