One verse

Srimad Bhagavatam 7.15.53

7.15.53

इन्द्रियाणि मनस्यूर्मौ वाचि वैकारिकं मन: । वाचं वर्णसमाम्नाये तमोङ्कारे स्वरे न्यसेत् । ओङ्कारं बिन्दौ नादे तं तं तु प्राणे महत्यमुम् ॥ ५३ ॥

indriyani manasy urmau vaci vaikarikam manah vacam varna-samamnaye tam omkare svare nyaset omkaram bindau nade tam tam tu prane mahaty amum

indriyani
the senses (acting and knowledge-gathering)
manasi
in the mind
urmau
in the waves of acceptance and rejection
vaci
in the words
vaikarikam
infected by changes
manah
the mind
vacam
the words
varna-samamnaye
in the aggregate of all alphabets
tam
that (aggregate of all alphabets)
omkare
in the concise form of omkara
svare
in the vibration
nyaset
one should give up
omkaram
the concise sound vibration
bindau
in the point of omkara
nade
in the sound vibration
tam
that
tam
that (sound vibration)
tu
indeed
prane
in the life air
mahati
unto the Supreme
amum
the living entity

The mind is always agitated by waves of acceptance and rejection. Therefore all the activities of the senses should be offered into the mind, which should be offered into one’s words. Then one’s words should be offered into the aggregate of all alphabets, which should be offered into the concise form omkara. Omkara should be offered into the point bindu, bindu into the vibration of sound, and that vibration into the life air. Then the living entity, who is all that remains, should be placed in Brahman, the Supreme. This is the process of sacrifice.