Śatapatha Brāhmaṇa ("of a hundred paths") 10.4.3.10

10.4.3.10

te ya evametadviduḥ ye vaitatkarma kurvate mṛtvā punaḥ sambhavanti te sambhavanta evāmṛtatvamabhisambhavantyatha ya evaṃ na vidurye vaitatkarma na kurvate mṛtvā punaḥ sambhavanti ta etasyaivānnam punaḥ-punarbhavanti

And they who so know this, or they who do this holy work, come to life again when they have died, and, coming to life, they come to immortal life. But they who do not know this, or do not do this holy work, come to life again when they die, and they become the food of him (Death) time after time.