One verse

Srimad Bhagavatam 3.6.30

3.6.30

मुखतोऽवर्तत ब्रह्म पुरुषस्य कुरूद्वह । यस्तून्मुखत्वाद्वर्णानां मुख्योऽभूद्ब्राह्मणो गुरु: ॥ ३० ॥

mukhato ’vartata brahma purusasya kurudvaha yas tunmukhatvad varnanam mukhyo ’bhud brahmano guruh

mukhatah
from the mouth
avartata
generated
brahma
the Vedic wisdom
purusasya
of the virat-purusa, the gigantic form
kuru-udvaha
O chief of the Kuru dynasty
yah
who are
tu
due to
unmukhatvat
inclined to
varnanam
of the orders of society
mukhyah
the chief
abhut
so became
brahmanah
called the brahmanas
guruh
the recognized teacher or spiritual master.

O chief of the Kuru dynasty, the Vedic wisdom became manifested from the mouth of the virat, the gigantic form. Those who are inclined to this Vedic knowledge are called brahmanas, and they are the natural teachers and spiritual masters of all the orders of society.