One verse

Srimad Bhagavatam 4.19.1

4.19.1

मैत्रेय उवाच अथादीक्षत राजा तु हयमेधशतेन स: । ब्रह्मावर्ते मनो: क्षेत्रे यत्र प्राची सरस्वती ॥ १ ॥

maitreya uvaca athadiksata raja tu hayamedha-satena sah brahmavarte manoh ksetre yatra praci sarasvati

maitreyah uvaca
the sage Maitreya said
atha
thereafter
adiksata
took initiation
raja
the King
tu
then
haya
horse
medha
sacrifices
satena
to perform one hundred
sah
he
brahmavarte
known as Brahmavarta
manoh
of Svayambhuva Manu
ksetre
in the land
yatra
where
praci
eastern
sarasvati
the river named Sarasvati.

The great sage Maitreya continued: My dear Vidura, King Prthu initiated the performance of one hundred horse sacrifices at the spot where the River Sarasvati flows towards the east. This piece of land is known as Brahmavarta, and it was controlled by Svayambhuva Manu.