One verse

Srimad Bhagavatam 3.28.8

3.28.8

शुचौ देशे प्रतिष्ठाप्य विजितासन आसनम् । तस्मिन्स्वस्ति समासीन ऋजुकाय: समभ्यसेत् ॥ ८ ॥

sucau dese pratisthapya vijitasana asanam tasmin svasti samasina rju-kayah samabhyaset

sucau dese
in a sanctified place
pratisthapya
after placing
vijita-asanah
controlling the sitting postures
asanam
a seat
tasmin
in that place
svasti samasinah
sitting in an easy posture
rju-kayah
keeping the body erect
samabhyaset
one should practice.

After controlling one’s mind and sitting postures, one should spread a seat in a secluded and sanctified place, sit there in an easy posture, keeping the body erect, and practice breath control.