One verse

Srimad Bhagavatam 7.15.31

7.15.31

देशे शुचौ समे राजन्संस्थाप्यासनमात्मन: । स्थिरं सुखं समं तस्मिन्नासीतर्ज्वङ्ग ओमिति ॥ ३१ ॥

dese sucau same rajan samsthapyasanam atmanah sthiram sukham samam tasminn asitarjv-anga om iti

dese
in a place
sucau
very sacred
same
level
rajan
O King
samsthapya
placing
asanam
on the seat
atmanah
one’s self
sthiram
very steady
sukham
comfortably
samam
equipoised
tasmin
on that sitting place
asita
one should sit down
rju-angah
the body perpendicularly straight
om
The Vedic mantra pranava
iti
in this way.

My dear King, in a sacred and holy place of pilgrimage one should select a place in which to perform yoga. The place must be level and not too high or low. There one should sit very comfortably, being steady and equipoised, keeping his body straight, and thus begin chanting the Vedic pranava.