Mahabharata 6.27.27

स्पर्शान्कृत्वा बहिर्बाह्यांश्चक्षुश्चैवान्तरे भ्रुवोःप्राणापानौ समौ कृत्वा नासाभ्यन्तरचारिणौ

sparśānkṛtvā bahirbāhyāṃścakṣuścaivāntare bhruvoḥprāṇāpānau samau kṛtvā nāsābhyantaracāriṇau

Our plain-language meaning of this verse is waiting for scholar review.