One verse

Srimad Bhagavatam 12.3.21

12.3.21

तदा क्रियातपोनिष्ठा नातिहिंस्रा न लम्पटा: । त्रैवर्गिकास्त्रयीवृद्धा वर्णा ब्रह्मोत्तरा नृप ॥ २१ ॥

tadā kriyā-tapo-niṣṭhā nāti-hiṁsrā na lampaṭāḥ trai-vargikās trayī-vṛddhā varṇā brahmottarā nṛpa

tadā
then (in the Tretā age)
kriyā
to ritualistic ceremonies
tapaḥ
and to penances
niṣṭhāḥ
devoted
na ati-hiṁsrāḥ
not excessively violent
na lampaṭāḥ
not wantonly desiring sense gratification
trai-vargikāḥ
interested in the three principles of religiosity, economic development and sense gratification
trayī
by the three Vedas
vṛddhāḥ
made prosperous
varṇāḥ
the four classes of society
brahma-uttarāḥ
mostly brāhmaṇas
nṛpa
O King

In the Tretā age people are devoted to ritual performances and severe austerities. They are not excessively violent or very lusty after sensual pleasure. Their interest lies primarily in religiosity, economic development and regulated sense gratification, and they achieve prosperity by following the prescriptions of the three Vedas. Although in this age society evolves into four separate classes, O King, most people are brāhmaṇas.