यज्ञशिष्टाशिनः सन्तो मुच्यन्ते सर्वकिल्बिषैः | भुञ्जते ते त्वघं पापा ये पचन्त्यात्मकारणात् ||३-१३||
yajñaśiṣṭāśinaḥ santo mucyante sarvakilbiṣaiḥ . bhuñjate te tvaghaṃ pāpā ye pacantyātmakāraṇāt ||3-13||
3.13. The righteous persons, who eat the remnants (objects enjoined) of the actions to be performed necessarily, are freed from all sins. But those who cook, intending their own selves, are sinners and eat sin.
Shri Purohit Swami
3.13 The sages who enjoy the food that remains after the sacrifice is made are freed from all sin; but the selfish who spread their feast only for themselves feed on sin only.
Sri Abhinav Gupta
3.13 Yajnasista-etc. Those who enjoy the pleasures of obects that have come to them on the authority of laws enjoining what is to be necessarily performed; and who enjoy them viewing [the enjoyment] only as a secondary (or intermediate) action and conseently as a subsidiary having no separate purpose; and again those who enjoy the remnant of the necessary action in the form of gratifying the group of the devas of the snese-organs-that residue of food marked with bliss in being firmly established in their own Self - that is to say, those who have mounted upon the Self and are desirous of enjoying objects only as a means to achieve this end - they are freed from all faults of good and bad. Those, who for their own selves etc. : On the other hand, those who believe, under the influence of ignorance, the sheer superficial enjoyment of objects as their final goal, and act with the notion ‘We perform this [act] for the sake of ourselves’ - those persons alone gain the sin in the form of good and bad.
3.13 Those persons who acire food materials solely for propitiating the Supreme Person abiding as the Self of Indra and other deities, and who, after cooking them, propitiate, through them, the Supreme Person as He is, and then sustain themselves on the remnants of oblations (made for such propitiation), they alone will be free of impurities which have resulted from beginningless evil and which are inimical to the vision of the self. But they are evil-minded, who acire for selfish use the things which the Supreme Being, abiding as the Self of Indra and other deities, has granted them for worshipping Him with, and use it all on the other hand for feeding themselves - they eat only sin. Turning away from the vision of the self, they cook only for being led to Naraka (for the expiation of the sin incurred thery).
Sri Krsna says that, from the standpoint of the world as well as that of the scriptures, everything has its origin in sacrifice; and He speaks of the need for the performance of the sacrifices and of the blemish in not performing the same:
3.13 Those again, who are yajna-sista-asinah, partakers of the remnants of sacrifices, who, after making offering to the gods and others, [The panca-maha-yajnas, five great offerings, which have to be made by every householder are offerings to gods, manes, humans, creatures and rsis (sages).] are habituated to eat the remnants (of those offerings), called nectar; they, santah, by being (so); mucyante, become freed; sarva-kilbisaih, from all sins-from those sins incurred through the five things [the five things are; oven, water-pot, cutting instruments, grinding machines and broom. A householder incurs sin by killing insects etc. with these things, knowingly or unknowingly. It is atoned by making the aforesaid five offerings.], viz oven etc., and also from those others incurred owing to injury etc. caused inadvertently. Tu, but; the papah, unholy persons, who are selfish; ye, who; pacanti, cook; atma-karanat, for themselves; te, they, being themselves sinful; bhunjate, incur; agham, sin. For the following reasons also actions should be undertaken by an eligible person. Action is definitely the cause of the movement of the wheel of the world. How? This is being answered:
3.13 Pious men who eat the remnants of sacrifices are freed from all sins. But the sinful ones who cook only for their own sake earn only sin.
3.13 By becoming partakers of the remembers of sacrifices, they become freed from all sins. But the unholy persons who cook for themselves, they incur sin.
3.13 The righteous who eat the remnants of the sacrifice are freed from all sins; but those sinful ones who cook food (only) for their own sake verily eat sin.
3.13 यज्ञशिष्टाशिनः who eat the remnants of the sacrifice? सन्तः the righteous? मुच्यन्ते are freed? सर्वकिल्बिषैः from all sins? भुञ्जते eat? ते those? तु indeed? अघम् sin? पापाः sinful ones? ये who? पचन्ति cook? आत्मकारणात् for their own sake.Commentary Those who? after performing the five great sacrifices? eat the remnants of the food are freed from all the sins committed by these five agents of insect slaughter? viz.? (1) the pestle and mortar? (2) the grinding stone? (3) the fireplace? (4) the place where the waterpot is kept? and (5) the broom. These are the five places where injury to life is daily committed. The sins are washed away by the performance of the five MahaYajnas or great sacrifices which every Dvija(twicorn or the people belonging to the first three castes in Hindu society? especially the Brahmin) ought to perform1. DevaYajna Offering sacrifices to the gods which will satisfy them?2. BrahmaYajna or RishiYajna Teaching and reciting the scriptures which will satisfy Brahman and the Rishis?3. PitriYajna Offering libations of water to ones ancestors which will satisfy the manes?4. NriYajna The feeding of the hungry and the guests? and?5. BhutaYajna The feeding of the subhuman species? such as animals? birds? etc.