One verse

Srimad Bhagavatam 8.14.8

8.14.8

ज्ञानं चानुयुगं ब्रूते हरि: सिद्धस्वरूपधृक् । ऋषिरूपधर: कर्म योगं योगेशरूपधृक् ॥ ८ ॥

jnanam canuyugam brute harih siddha-svarupa-dhrk rsi-rupa-dharah karma yogam yogesa-rupa-dhrk

jnanam
transcendental knowledge
ca
and
anuyugam
according to the age
brute
explains
harih
the Supreme Personality of Godhead
siddha-svarupa-dhrk
assuming the form of liberated persons like Sanaka and Sanatana
rsi-rupa-dharah
assuming the form of great saintly persons like Yajnavalkya
karma
karma
yogam
the mystic yoga system
yoga-isa-rupa-dhrk
by assuming the form of a great yogi like Dattatreya

In every yuga, the Supreme Personality of Godhead, Hari, assumes the form of Siddhas such as Sanaka to preach transcendental knowledge, He assumes the form of great saintly persons such as Yajnavalkya to teach the way of karma, and He assumes the form of great yogis such as Dattatreya to teach the system of mystic yoga.