Bhagavad Gita 5.27

स्पर्शान्कृत्वा बहिर्बाह्यांश्चक्षुश्चैवान्तरे भ्रुवोः। प्राणापानौ समौ कृत्वा नासाभ्यन्तरचारिणौ

sparśhān kṛitvā bahir bāhyānśh chakṣhuśh chaivāntare bhruvoḥ prāṇāpānau samau kṛitvā nāsābhyantara-chāriṇau yatendriya-mano-buddhir munir mokṣha-parāyaṇaḥ vigatechchhā-bhaya-krodho yaḥ sadā mukta eva saḥ

Having external contacts excluded, and with gaze fixed between the eyebrows; having made equal the outgoing and ingoing breaths moving within the nostrils;