One verse

Srimad Bhagavatam 3.10.4

3.10.4

मैत्रेय उवाच विरिञ्चोऽपि तथा चक्रे दिव्यं वर्षशतं तप: । आत्मन्यात्मानमावेश्य यथाह भगवानज: ॥ ४ ॥

maitreya uvaca virinco ’pi tatha cakre divyam varsa-satam tapah atmany atmanam avesya yathaha bhagavan ajah

maitreyah uvaca
the great sage Maitreya said
virincah
Brahma
api
also
tatha
in that manner
cakre
performed
divyam
celestial
varsa-satam
one hundred years
tapah
penances
atmani
unto the Lord
atmanam
his own self
avesya
engaging
yatha aha
as it was spoken
bhagavan
the Personality of Godhead
ajah
the unborn.

The greatly learned sage Maitreya said: O Vidura, Brahma thus engaged himself in penances for one hundred celestial years, as advised by the Personality of Godhead, and applied himself in devotional service to the Lord.