BG 6.13
समं कायशिरोग्रीवं धारयन्नचलं स्थिरः। संप्रेक्ष्य नासिकाग्रं स्वं दिशश्चानवलोकयन्
samaṁ kāya-śhiro-grīvaṁ dhārayann achalaṁ sthiraḥ samprekṣhya nāsikāgraṁ svaṁ diśhaśh chānavalokayan
Let him hold his body, head, and neck erect, motionless and steady; let him look fixedly at the tip of his nose, turning neither to the right nor to the left.
Translated by Shri Purohit Swami
Let him firmly hold his body, head, and neck erect and still, gazing at the tip of his nose without looking around.
Translated by Swami Sivananda
Word meanings (from the gita/gita dataset)
samam—straight; kāya—body; śhiraḥ—head; grīvam—neck; dhārayan—holding; achalam—unmoving; sthiraḥ—still; samprekṣhya—gazing; nāsika-agram—at the tip of the nose; svam—own; diśhaḥ—directions; cha—and; anavalokayan—not looking