B.G 6.13 and 14

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.