One verse

Srimad Bhagavatam 5.8.1

5.8.1

श्रीशुक उवाच एकदा तु महानद्यां कृताभिषेकनैयमिकावश्यको ब्रह्माक्षरमभिगृणानो मुहूर्तत्रयमुदकान्त उपविवेश ॥ १ ॥

sri-suka uvaca ekada tu maha-nadyam krtabhiseka-naiyamikavasyako brahmaksaram abhigrnano muhurta-trayam udakanta upavivesa.

sri-sukah uvaca
Sri Sukadeva Gosvami said
ekada
once upon a time
tu
but
maha-nadyam
in the great river known as Gandaki
krta-abhiseka-naiyamika-avasyakah
having taken a bath after finishing the daily external duties such as passing stool and urine and brushing the teeth
brahma-aksaram
the pranava-mantra (om)
abhigrnanah
chanting
muhurta-trayam
for three minutes
udaka-ante
on the bank of the river
upavivesa
he sat down

Sri Sukadeva Gosvami continued: My dear King, one day, after finishing his morning duties—evacuating, urinating and bathing—Maharaja Bharata sat down on the bank of the River Gandaki for a few minutes and began chanting his mantra, beginning with omkara.