B.G 6.13 and 14

समं कायशिरोग्रीवं धारयन्नचलं स्थिरः। सम्प्रेक्ष्य नासिकाग्रं स्वं दिशश्चानवलोकयन् ॥१३॥

प्रशान्तात्मा विगतभीर्ब्रह्मचारिव्रते स्थितः। मनः संयम्य मच्चित्तो युक्त आसीत मत्परः ॥१४॥

samaṁ kāyaśirogrīvaṁ dhārayannacalaṁ sthiraḥ। samprekṣya nāsikāgraṁ svaṁ diśaścānavalokayan ॥13॥

praśāntātmā vigatabhīrbrahmacārivrate sthitaḥ। manaḥ saṁyamya maccitto yukta āsīta matparaḥ ॥14॥

Keeping evenly the body, the head, and the neck; wearing the object of meditation in the mind; keeping the mind steady and not wandering; having fixed the gaze at the tip of the nose and not looking in other directions; having a tranquil self that is free from fear; controlling the mind and having established in the vow of celibacy; must unite his consciousness in Me and be situated in Me as the supreme goal.