Śatapatha Brāhmaṇa ("of a hundred paths") 6.1.2.15

6.1.2.15

tadāhuḥ | kiṃ hitaṃ kimupahitamiti prāṇa eva hitaṃ vāgupahitam prāṇe hīyaṃ vāgupeva hitā prāṇastveva hitamaṅgānyupahitam prāṇe hīmānyaṅgānyupeva hitāni

As to this they say, 'What is hita, and what is upahita?' The vital air, forsooth, is the 'hita,' and speech is the 'upahita,' for it is on the vital air that this speech is based (upa-hitâ). The vital air, again, is the 'hita,' and the limbs are the 'upahita,' for on the vital air these limbs are indeed based.