Śatapatha Brāhmaṇa ("of a hundred paths") 7.4.2.11

7.4.2.11

yadveva dūrveṣṭakāmupadadhāti | prajāpatervisrastasya yāni lomānyaśīyanta tā imā oṣadhayo 'bhavannathāsmātprāṇo madhyata udakrāmattasminnutkrānte 'padyata

And, again, why he lays down the Dûrvâ-brick. The hair of Pragâpati which were lying on the ground when he was disjointed became these herbs. The vital air then went out from within him, and, that having gone out, he fell down.