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।


English Translation of Sanskrit Commentary By Sri Shankaracharya's
4.30 Besides, apare, others; niyata-aharah, having their food regulated; juhvati, offer; pranan, the vital forces, the different kinds of vital forces; pranesu, in the vital forces themselves. Whichever function of the vital forces is brought under control, in it they offer the other functions. These latter become, as it were, merged in the former. Sarve api, all; of ete, them; yajna-vidah, are knowers of the sacrifice; and yajna-ksapita-kamasah, have their sins destroyed by the sacrifices as mentioned above.
After accomplishing the above-mentioned sacrifices,


English Translation of Commentary  - Dr. S. Sankaranarayan
4.29-30 Apane etc.  Apare etc.  Prana  (1st)  :  the arising  one i.e.,  the nada which has, as its end, that one where the first syllabic instance of  Pranava  dissolves.   Into the apana : into  what sets down,  and is of the nature of entering  inot the Svananda.  They offer :  Thus is the svadhyaya of the nature of the firmness of the body is described.
 
What sets down, some  [sages]  established on what rises up,  so that the pupils  self  (mind)  may learn the processes of sending out and drawing  in [the vital airs].  By [thus]  uniting  these two, they bestow emanciaption on their own Self  and on the Self of the pupils;  and they,  on that account, remain with their mind firmly established on the svadhyaya-sacrifice full of Svananda  (i.e.,  Nijananda) and Parananda - a svadhyaya of the nature of examining,  enlightening, entering and uniting  [the prana nad apana]  in their own Self  and in the Self  of the pupils.  That is why the process of filling  [the vital air] in has been first  mentioned;  and the process of  emptying the same out at the last.  Further, the process of the inward turning of the act of enjoying objects, is  suggested by the first  arter of the verse (29),  and by the second  arter the act of coming  out for enjoying  the objects through the process of having the supreme state-of-bodylessness.  Therefore,  the performers of the sacrifice of wisdom are not different  from the performers of the svadhyaya-sacrifice.
 
The same sages have the desries of  their  own and of their pupils fulfilled  on  account  of their  thorough practice of the said  activity;  control both the said  paths, restrict their food viz.,  enjoyment of objects;  and offer pranas  into the pranas, i.e,  they offer, by means of the ietude at the stage  of stopping  [the vital air],  the rising  of all the mental modifications into the splendour of rising waves  of  Parananda and  Nirananda.  All these persons  know the truth (or nature) of hte sacrifices, starting from the material-sacrifice upto the wisdom-sacrifice;  only by that means they have eradicated their sins; that is to say,  they have uprooted the mighty delusion with its roots,  made of mental  impressions of duality.


English Translation of Ramanuja's Sanskrit Commentary
4.29 - 4.30 Other Karma Yogins are devoted to the practice of breath control. They are of three types because of the differences in inhalation, exhalation and stoppage of breath. Puraka (inhalation) is that in which the inward breath is sacrificed in the outward breath. Recaka (exhalation) is that when the outward breath is sacrificed in the inward breath. Kumbhaka (stoppage of breath) is that when the flow of both inward and outward breaths is stopped. The clause, restricting of diet, applies to all the three types of persons devoted to the control of breath.

All these, according to their liking and capacity are engaged in performing the various kinds of Karma Yoga beginning from the sacrifice of material objects to the control of breath. They know and are devoted to sacrifices comprising obligatory and occasional rituals preceded by the performance of the great sacrifices (Panca-Maha-Yajna), as alluded to in Creating men along with the sacrifices (3.10). Because of this only, their sins are done away with. Those who are engaged in Karma Yoga by sustaining their bodies only by the ambrosia of sacrificial remains will go to the eternal Brahman. Go to Brahman here means realise the self which has Brahman for Its soul.


Transliteration Bhagavad Gita 4.30Apare niyataahaaraah praanaan praaneshu juhwati;
Sarve’pyete yajnavido yajnakshapita kalmashaah.


Word Meanings Bhagavad Gita 4.30apāne—the incoming breath; juhvati—offer; prāṇam—the outgoing breath; prāṇe—in the outgoing breath; apānam—incoming breath; tathā—also; apare—others; prāṇa—of the outgoing breath; apāna—and the incoming breath; gatī—movement; ruddhvā—blocking; prāṇa-āyāma—control of breath; parāyaṇāḥ—wholly devoted; apare—others; niyata—having controlled; āhārāḥ—food intake; prāṇān—life-breaths; prāṇeṣhu—life-energy; juhvati—sacrifice; sarve—all; api—also; ete—these; yajña-vidaḥ—knowers of sacrifices; yajña-kṣhapita—being cleansed by performances of sacrifices; kalmaṣhāḥ—of impurities