One verse

Bhagavad Gita 6.13

6.13

समं कायशिरोग्रीवं धारयन्नचलं स्थिरः | सम्प्रेक्ष्य नासिकाग्रं स्वं दिशश्चानवलोकयन् ||६-१३||

samaṃ kāyaśirogrīvaṃ dhārayannacalaṃ sthiraḥ . samprekṣya nāsikāgraṃ svaṃ diśaścānavalokayan ||6-13||

samam
straight
kāya
body
śiraḥ
head
grīvam
and neck
dhārayan
holding
acalam
unmoving
sthiraḥ
still
samprekṣya
looking
nāsikā
of the nose
agram
at the tip
svam
own
diśaḥ
on all sides
ca
also
anavalokayan
not looking

One should hold one's body, neck, and head erect in a straight line and stare steadily at the tip of the nose. Thus, with an unagitated, subdued mind, devoid of fear, completely free from sex life, one should meditate upon Me within the heart and make Me the ultimate goal of life.