Bhagavad Gita Chapter 4 Verse 30
भगवद् गीता अध्याय 4 श्लोक 30

अपरे नियताहाराः प्राणान्प्राणेषु जुह्वति।
सर्वेऽप्येते यज्ञविदो यज्ञक्षपितकल्मषाः।।4.30।।



हिंदी अनुवाद - स्वामी रामसुख दास जी ( भगवद् गीता 4.30)
।।4.29  4.30।।दूसरे कितने ही प्राणायामके परायण हुए योगीलोग अपानमें प्राणका पूरक करके प्राण और अपानकी गति रोककर फिर प्राणमें अपानका हवन करते हैं तथा अन्य कितने ही नियमित आहार करनेवाले प्राणोंका प्राणोंमें हवन किया करते हैं। ये सभी साधक यज्ञोंद्वारा पापोंका नाश करनेवाले और यज्ञोंको जाननेवाले हैं।


Shri Vaishnava Sampradaya - Commentary



Commencing with artha-yagnas  or  offering  of  donations  for  worship  and
propitiation of the Supreme Lord up to the  yagna  of  pranayama  or  breath
control, different varieties of karma yoga or  prescribed  Vedic  activities
are given that  are  engaged  in  by  persons  according  to  qualification.
Clearly comprehending the purport of chapter 3, verse  10  that  all  beings
are blessed and benefited  by  yagna;  these  practitioners  have  dedicated
their lives to the performance of yagna and yet  they  do  not  neglect  the
regular daily duties as well as the occasional duties as prescribed  in  the
Vedic injunctions. Thus they have  acted  for  their  ultimate  welfare  and
destroyed all of their  sinful  reactions  from  past  actions.  Maintaining
their existence  by  partaking  exclusively  only  of  the  sanctified  food
offered in yagna these practitioners of karma yoga  eventually  realise  the
atma or soul within their etheric heart and perceive the eternal Brahman  or
the spiritual substratum pervading all existence which leads to the  Supreme
Lord.