Bhagavad Gita 3.13
यज्ञशिष्टाशिन: सन्तो मुच्यन्ते सर्वकिल्बिषै: |
भुञ्जते ते त्वघं पापा ये पचन्त्यात्मकारणात् ||
yajna-shishtashinah santo muchyante sarva-kilbishaih
bhunjate te tvagham papa ye pachantyatma-karanat
The spiritually-minded, who eat food that is first offered in sacrifice, are released from all kinds of sin.
Others, who cook food for their own enjoyment, verily eat only sin.
Commentary :
Every food inevitably involves violence.
Obviously non-vegetarian food eaters enjoy the flesh of a murdered animal that suffered in great fear and pain.
But even vegetarian food causes some pain to plants, animals that get crushed under tractor, insects/microbes that get drowned or burned while cooking etc.
To avoid this sin, there are 2 ways :
- Don't eat anything. This method is followed by Jain monks who simply give up their body and die.
- Offer food as sacrifice (yagna, puja) to Bhagavan, who pardons the sin. This method is followed by almost every religion/sect - Brahmins (Pariseshan), Hindus (Nivedan/Prasad), Muslims (bismillah), Christians (grace).
There are varying levels in-between, where some only eat Uncha-Vritthi (only gathering grains and fruits that have automatically fallen on ground), Kapota-Vritthi (only buying/saving food for 1 day, not caring about tomorrow), Ajagara-Vritthi (only eating whatever falls on their lap)
Pancha-Maha-Yagna or 5 great sacrifices are ordained as part of daily life for a Gruhastha (householder), in order to absolve oneself of sin that occurs in 5 places during daily life (cooking, cutting, sweeping, storing, one more i forget) :
Brahma yagna (to Bhagavan & Rishis)
Deva Yagna (to devas)
Pitru Yagna (to ancestors)
Manushya Yagna (to relatives)
Bhuta Yagna (to animals)
