One verse

Srimad Bhagavatam 4.23.32

4.23.32

ब्राह्मणो ब्रह्मवर्चस्वी राजन्यो जगतीपति: । वैश्य: पठन् विट्पति: स्याच्छूद्र: सत्तमतामियात् ॥ ३२ ॥

brahmano brahma-varcasvi rajanyo jagati-patih vaisyah pathan vit-patih syac chudrah sattamatam iyat

brahmanah
the brahmanas
brahma-varcasvi
one who has attained the power of spiritual success
rajanyah
the royal order
jagati-patih
the king of the world
vaisyah
the mercantile class of men
pathan
by reading
vit-patih
becomes master of animals
syat
becomes
sudrah
the laborer class of men
sattama-tam
the position of a great devotee
iyat
attains.

If one hears of the characteristics of Prthu Maharaja and is a brahmana, he becomes perfectly qualified with brahminical powers; if he is a ksatriya, he becomes a king of the world; if he is a vaisya, he becomes a master of other vaisyas and many animals; and if he is a sudra, he becomes the topmost devotee.