BG 4.29
अपाने जुह्वति प्राणं प्राणेऽपानं तथापरे
प्राणापानगती रुद्ध्वा प्राणायामपरायणाः
apāne juhvati prāṇaṃ prāṇe'pānaṃ tathāpare
prāṇāpānagatī ruddhvā prāṇāyāmaparāyaṇāḥ
TRANSLATION
Others, with restricted diet, are devoted to the control of breath. Some sacrifice the inward breath in the outward breath. Similarly others sacrifice the outward breath in the inward breath. Some others, stopping the flow of both the inward breath and the outward, sacrifice the inward breaths and outward breaths.
