One verse

Srimad Bhagavatam 3.28.6

3.28.6

स्वधिष्ण्यानामेकदेशे मनसा प्राणधारणम् । वैकुण्ठलीलाभिध्यानं समाधानं तथात्मन: ॥ ६ ॥

sva-dhisnyanam eka-dese manasa prana-dharanam vaikuntha-lilabhidhyanam samadhanam tathatmanah

sva-dhisnyanam
within the vital air circles
eka-dese
in one spot
manasa
with the mind
prana
the vital air
dharanam
fixing
vaikuntha-lila
on the pastimes of the Supreme Personality of Godhead
abhidhyanam
concentration
samadhanam
samadhi
tatha
thus
atmanah
of the mind.

Fixing the vital air and the mind in one of the six circles of vital air circulation within the body, thus concentrating one’s mind on the transcendental pastimes of the Supreme Personality of Godhead, is called samadhi, or samadhana, of the mind.