Bhagavad Gita 4.29
अपाने जुह्वति प्राणं प्राणेऽपानं तथापरे | प्राणापानगती रुद्ध्वा प्राणायामपरायणाः ||४-२९||
apāne juhvati prāṇaṃ prāṇe.apānaṃ tathāpare . prāṇāpānagatī ruddhvā prāṇāyāmaparāyaṇāḥ ||4-29||
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Recitation
4.29 Others offer as sacrifice the outgoing breath in the incoming, and the incoming in the outgoing, restraining the course of the outgoing and the incoming breaths, solely absorbed in the restraint of the breath.
Still others, who are inclined to the process of breath restraint to remain in trance, practice by offering the movement of the outgoing breath into the incoming, and the incoming breath into the outgoing, and thus at last remain in trance, stopping all breathing. Others, curtailing the eating process, offer the outgoing breath into itself as a sacrifice.