PRAŚNA UPANISHAD · 3.5

पायूपस्थेऽपानं चक्षुःश्रोत्रे मुखनासिकाभ्यां प्राणः स्वयं
प्रातिष्ठते मध्ये तु समानः । एष ह्येतद्धुतमन्नं समं नयति
तस्मादेताः सप्तार्चिषो भवन्ति ॥ ३.५॥

pāyūpasthe’pānaṃ cakṣuḥśrotre mukhanāsikābhyāṃ prāṇaḥ svayaṃ
prātiṣṭhate madhye tu samānaḥ । eṣa hyetaddhutamannaṃ samaṃ nayati
tasmādetāḥ saptārciṣo bhavanti ॥ 3.5॥

“In the anus and the organ of pleasure is the lower breath, and in the eyes and the ears, the mouth and the nose, the main breath itself is seated; but the medial breath is in the middle. This is he that equally distributeth the burnt offering of food; for from this are the seven fires born.

Sri Aurobindo · CWSA 18, p. 183