Bhagavad Gita 4.30
अपरे नियताहाराः प्राणान्प्राणेषु जुह्वति। सर्वेऽप्येते यज्ञविदो यज्ञक्षपितकल्मषाः।।4.30।।
apare niyatāhārāḥ prāṇānprāṇeṣu juhvati| sarve'pyete yajñavido yajñakṣapitakalmaṣāḥ||4.30||
apare niyataharah prananpraneshu juhvati sarve'pyete yajnavido yajnakshapitakalmashah4.30
Meaning
Yet others, who regulate their diet, offer the life-breath into itself. All these practitioners understand the principle of sacrifice and are cleansed of sin through their practice.
दूसरे नियमित आहार करने वाले (साधक जन) प्राणों को प्राणों में हवन करते हैं। ये सभी यज्ञ को जानने वाले हैं, जिनके पाप यज्ञ के द्वारा नष्ट हो चुके हैं।
This is verse 30 of 42 in Chapter 4 (Jnana Karma Sanyasa Yoga) of the Bhagavad Gita.