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Śrīmad-Bhāgavatam
[Canto 5, Ch. 26]
there;  śata-sahasra-yojane —measuring 100,000  yojanas  (800,000 miles);  kṛmi-kuṇḍe —in a lake of worms;  kṛmi-bhūtaḥ —becoming one of the worms;  svayam —he himself;  kṛmibhiḥ —by the other worms;  eva —certainly;  bhakṣyamāṇaḥ —being eaten;  kṛmi-bhojanaḥ —eating worms;  yāvat —as long as;  tat —that lake is wide;  apratta-aprahūta —unshared and unoffered food;  adaḥ —one who eats;  anirveśam —who has not performed atonement;  ātmānam —to himself;  yātayate —gives pain.
TRANSLATION
A person is considered no better than a crow if after receiving some food, he does not divide it among guests, old men and children, but simply eats it himself, or if he eats it without performing the five kinds of sacrifice. After death he is put into the most abominable hell, known as Kṛmibhojana. In that hell is a lake 100,000  yojanas  [800,000 miles] wide and filled with worms. He becomes a worm in that lake and feeds on the other worms there, who also feed on him. Unless he atones for his actions before his death, such a sinful man remains in the hellish lake of Kṛmibhojana for as many years as there are  yojanas  in the width of the lake.
PURPORT
As stated in  Bhagavad-gītā  (3.13):
yajña-śiṣṭāśinaḥ santo mucyante sarva-kilbiṣaiḥ bhuñjate te tv agham pāpā ya pacanty ātma-kāraṇāt
“The devotees of the Lord are released from all kinds of sins because they eat food which is first offered for sacrifice. Others, who prepare food for personal sense enjoyment, verily eat only sin.” All food is given to us by the Supreme Personality of Godhead.  Eko bahūnāṁ yo vidadhāti kāmān : the Lord supplies everyone with the necessities of life. Therefore we should acknowledge His mercy by performing  yajña  (sacrifice). This is the duty of everyone. Indeed, the sole purpose of life is to perform  yajña . According to Kṛṣṇa (Bg. 3.9):