One verse

Srimad Bhagavatam 5.26.17

5.26.17

यस्त्विह वै भूतानामीश्वरोपकल्पितवृत्तीनामविविक्तपरव्यथानां स्वयं पुरुषोपकल्पितवृत्तिर्विविक्तपरव्यथो व्यथामाचरति स परत्रान्धकूपे तदभिद्रोहेण निपतति तत्र हासौ तैर्जन्तुभि: पशुमृगपक्षिसरीसृपैर्मशकयूकामत्कुणमक्षिकादिभिर्ये के चाभिद्रुग्धास्तै: सर्वतोऽभिद्रुह्यमाणस्तमसि विहतनिद्रानिर्वृतिरलब्धावस्थान: परिक्रामति यथा कुशरीरे जीव: ॥ १७ ॥

yas tv iha vai bhutanam isvaropakalpita-vrttinam avivikta-para-vyathanam svayam purusopakalpita-vrttir vivikta-para-vyatho vyatham acarati sa paratrandhakupe tad-abhidrohena nipatati tatra hasau tair jantubhih pasu-mrga-paksi-sarisrpair masaka-yuka-matkuna-maksikadibhir ye ke cabhidrugdhas taih sarvato ’bhidruhyamanas tamasi vihata-nidra-nirvrtir alabdhavasthanah parikramati yatha kusarire jivah.

yah
any person who
tu
but
iha
in this life
vai
indeed
bhutanam
to some living entities
isvara
by the supreme controller
upakalpita
designed
vrttinam
whose means of livelihood
avivikta
not understanding
para-vyathanam
the pain of others
svayam
himself
purusa-upakalpita
designed by the Supreme Personality of Godhead
vrttih
whose livelihood
vivikta
understanding
para-vyathah
the painful conditions of others
vyatham acarati
but still causes pain
sah
such a person
paratra
in his next life
andhakupe
to the hell named Andhakupa
tat
to them
abhidrohena
by the sin of malice
nipatati
falls down
tatra
there
ha
indeed
asau
that person
taih jantubhih
by those respective living entities
pasu
animals
mrga
wild beasts
paksi
birds
sarisrpaih
snakes
masaka
mosquitoes
yuka
lice
matkuna
worms
maksika-adibhih
flies and so on
ye ke
whoever else
ca
and
abhidrugdhah
persecuted
taih
by them
sarvatah
everywhere
abhidruhyamanah
being injured
tamasi
in the darkness
vihata
disturbed
nidra-nirvrtih
whose resting place
alabdha
not being able to obtain
avasthanah
a resting place
parikramati
wanders
yatha
just as
ku-sarire
in a low-grade body
jivah
a living entity

By the arrangement of the Supreme Lord, low-grade living beings like bugs and mosquitoes suck the blood of human beings and other animals. Such insignificant creatures are unaware that their bites are painful to the human being. However, first-class human beings—brahmanas, ksatriyas and vaisyas—are developed in consciousness, and therefore they know how painful it is to be killed. A human being endowed with knowledge certainly commits sin if he kills or torments insignificant creatures, who have no discrimination. The Supreme Lord punishes such a man by putting him into the hell known as Andhakupa, where he is attacked by all the birds and beasts, reptiles, mosquitoes, lice, worms, flies, and any other creatures he tormented during his life. They attack him from all sides, robbing him of the pleasure of sleep. Unable to rest, he constantly wanders about in the darkness. Thus in Andhakupa his suffering is just like that of a creature in the lower species.