Śatapatha Brāhmaṇa ("of a hundred paths") 13.2.5.3

13.2.5.3

prajāpatirvirājamasṛjata sāsmātsṛṣṭā parācyetsāśvam medhyam prāviśattāṃ daśibhiranuprāyuṅkta tāmāpnottāmāptvā daśibhiravārunddha yaddaśina ālabhate virājameva tairyajamāno'varunddhe śatamālabhate śatāyurvai puruṣaḥ śatendriya āyurevendriyaṃ vīryamātmandhatte

Pragâpati created the Virâg; when created, it went away from him, and entered the horse meet for sacrifice. He followed it up with sets of ten (beasts). He found it, and, having found it, he took possession of it by means of the sets of ten: when he seizes the sets of eleven (beasts), the Sacrificer thereby takes possession. of the Virâg. He seizes a hundred, for man has a life of a hundred (years) and a hundred energies: vital power and energy, vigour, he thus takes to himself.