Śatapatha Brāhmaṇa ("of a hundred paths") 1.3.5.12

1.3.5.12

tā haitā gataśrerevānubrūyāt | ya icenna śreyāṃtsyāṃna pāpīyāniti yādṛśāya haiva sate 'nvāhustādṛṅvā haiva bhavati pāpīyānvā yasyaivaṃ viduṣa etā anvāhuḥ so eṣā mīmāṃsaiva na tvevaitā anūcyante

Let him recite them only for one of established prosperity (gatasrî), who would not wish to become either better or worse. For, what he for whom they recite is like, like that he will either be or worse, for whom, that knows this, they recite those (twenty-one verses). This, however, is mere speculation, for those (twenty-one verses) are not recited.