Bhagavad Gita Chapter 4 Verse 29-30

Gita 4.29, 4.30

अपाने, जुह्नति, प्राणम्, प्राणे, अपानम्, तथा, अपरे,
प्राणापानगती, रुद्ध्वा, प्राणायामपरायणाः।।29।।

अपरे, नियताहाराः, प्राणान्, प्राणेषु, जुह्नति,
सर्वे, अपि, एते, यज्ञविदः, यज्ञक्षपितकल्मषाः।।30।।

Gita 4.29 - 4.30

Apaane, juhvati, praanm’, praane, apaanm’, tatha, apre,
Praanaapaangati, rud’dhva, praanaayaamparaayanaH ||29||

Apre, niyataahaaraH, praanaan’, praaneshu, juhvati,
Sarve, api, ete, yagyavidH, yagyakshpitkalmashaH ||30||

Translation: (Apre) Others (apaane) in the outgoing breath (praanm’) the incoming breath/breath air/life air (juhvati) try to burn sins in the form of sacrifice (tatha) likewise (praane) in the incoming breath (apaanm’) the outgoing breath and (apre) many others (niyataahaaraH) who eat in moderation (praanaayaamparaayanaH) devoted to breath control (praanaapaangati) movement of the incoming and the outgoing breath (ruddhva) restraining (praanaan’) by making the life-breaths minute (praaneshu) in life-breaths only (juhvati) try to burn in the form of sacrifice i.e. try to attain God by doing Praanayam (ete) these (sarve, api) all devotees (yagyakshpitkalmashaH) destruction of sins by the above-mentioned religious acts i.e. sadhnas (yagyavidH) consider the means of bhakti i.e. consider this sadhna only to be the path to salvation. (29-30)

Gita 4.29-30: Others try to sacrifice incoming breath into outgoing breath to burn sins. Likewise, sacrifice the outgoing breath into the incoming breath, and many others, who eat in moderation, devoted to breath control, by restraining the movement of the incoming and the outgoing breath, and by making their life-breaths minute try to burn them in the life-breaths only in the form of sacrifice i.e. try to attain God by doing Praanyam. All these devotees consider the above-mentioned religious acts i.e. sadhnas to be the means of bhakti which destroy sins. In other words consider this very sadhna to be the path to salvation.