Hiranyakeshigrihyasutra 1.1.4.8

1.1.4.8

athainaṃ paridadāti \ parīmamindra brahmaṇe mahe śrotrāya dadhmasi \ athainaṃ jarimā ṇayejjyokśrotre adhijāgarat \ iti brāhmaṇam \ parīmamindra brahmaṇe mahe rāṣṭrāya dadhmasi \ athainaṃ jarimā ṇayejjyogrāṣṭre adhijāgarat \ iti rājanyam \ parīmamindra brahmaṇe mahe poṣāya dadhmasi \ athainaṃ jarimā ṇayejjyokpoṣe adhijāgarat \ iti vaiśyam \8\

He then gives him in charge (to the gods), a Brâhmana with (the verse), 'We give this (boy) in charge, O Indra, to Brahman, for the sake of great learning. May he (Brahman?) lead him to old age, and may he (the boy) long watch over learning.'
A Râganya (he gives in charge to the gods) with (the verse), 'We give this boy in charge, O Indra, to Brahman, for the sake of great royalty. May he lead him to old age, and may he long watch over royalty.'
A Vaisya (he gives in charge) with (the verse), 'We give this boy in charge, O Indra, to Brahman, for the sake of great wealth. May he lead him to old age, and may he long watch over wealth.'