Srimad Bhagavatam Canto 05, Chapter 26, Text 18

SB 5.26.18

yas tv iha va asamvibhajyasnati yat kiñcanopanatam anirmita-pañca-yajño vayasa-samstutah sa paratra
krmibhojane narakadhame nipatati tatra sata-sahasra-yojane krmi-kunde krmi-bhutah svayam krmibhir eva
bhaksyamanah krmi-bhojano yavat tad aprattaprahutado ’nirvesam atmanam yatayate.
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
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 Krmibhojana. 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 Krmibhojana for as many years as there are yojanas in the width of the lake.
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
As stated in Bhagavad-gita (3.13):
yajña-sistasinah santo
 mucyante sarva-kilbisaih
bhuñjate te tv agham papa
 ya pacanty atma-karanat
“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 bahunam yo vidadhati kaman: 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 Krsna (Bg. 3.9):
yajñarthat karmano ’nyatra
 loko ’yam karma-bandhanah
tad-artham karma kaunteya
 mukta-sangah samacara
“Work done as a sacrifice for Visnu has to be performed; otherwise work binds one to this material world. Therefore, O son of Kunti, perform your prescribed duties for His satisfaction, and in that way you will always remain unattached and free from bondage.” If we do not perform yajña and distribute prasada to others, our lives are condemned. Only after performing yajña and distributing the prasada to all dependents — children, brahmanas and old men — should one eat. However, one who cooks only for himself or his family is condemned, along with everyone he feeds. After death he is put into the hell known as Krmibhojana.
Srimad Bhagavatam Canto 05, Chapter 26, Text 17
Srimad Bhagavatam Canto 05, Chapter 26, Text 19