Śatapatha Brāhmaṇa ("of a hundred paths") 10.6.1.4

10.6.1.4

sa hovācāruṇamaupaveśiṃ gautama kaṃ tvaṃ vaiśvānaraṃ vettheti pṛthivīmeva rājanniti hovācomiti hovācaiṣa vai vaiśvānara etaṃ hi vai tvam pratiṣṭhāṃ vaiśvānaraṃ vettha tasmāttvam pratiṣṭhitaḥ prajayā paśubhirasi yo vā etam pratiṣṭhāṃ vaiśvānaraṃ vedāpa punarmṛtyuh+ jayati sarvamāyureti pādau tvā etau vaiśvānarasya pādau te'mlāsyatāṃ yadi ha nāgamiṣya iti pādau te'viditāvabhaviṣyatāṃ yadi ha nāgamiṣya iti vā

He then said to Aruna Aupavesi, 'O Gautama, as whom knowest thou Vaisvânara?'--'As Earth only, O king;' he replied.--'Yea,' he said, 'that indeed is Vaisvânara, the foundation; and because thou knowest the Vaisvânara Foundation (pratishthâ) therefore thou art firmly established (pratishthita) with offspring and cattle; and, verily, he who knows that Vaisvânara Foundation, repels Death and attains all life. But, in truth, these are only the feet of Vaisvânara, and thy feet would have withered away, hadst thou not come hither; or the feet would be unknown to thee, hadst thou not come hither.'