One verse

Srimad Bhagavatam 3.21.6

3.21.6

मैत्रेय उवाच प्रजा: सृजेति भगवान् कर्दमो ब्रह्मणोदित: । सरस्वत्यां तपस्तेपे सहस्राणां समा दश ॥ ६ ॥

maitreya uvaca prajah srjeti bhagavan kardamo brahmanoditah sarasvatyam tapas tepe sahasranam sama dasa

maitreyah uvaca
the great sage Maitreya said
prajah
children
srja
beget
iti
thus
bhagavan
the worshipful
kardamah
Kardama Muni
brahmana
by Lord Brahma
uditah
commanded
sarasvatyam
on the bank of the River Sarasvati
tapah
penance
tepe
practiced
sahasranam
of thousands
samah
years
dasa
ten.

The great sage Maitreya replied: Commanded by Lord Brahma to beget children in the worlds, the worshipful Kardama Muni practiced penance on the bank of the River Sarasvati for a period of ten thousand years.