One verse

Srimad Bhagavatam 7.15.64

7.15.64

यद् ब्रह्मणि परे साक्षात्सर्वकर्मसमर्पणम् । मनोवाक्तनुभि: पार्थ क्रियाद्वैतं तदुच्यते ॥ ६४ ॥

yad brahmani pare saksat sarva-karma-samarpanam mano-vak-tanubhih partha kriyadvaitam tad ucyate

yat
that which
brahmani
in the Supreme Brahman
pare
transcendental
saksat
directly
sarva
of all
karma
activities
samarpanam
dedication
manah
by the mind
vak
the words
tanubhih
and the body
partha
O Maharaja Yudhisthira
kriya-advaitam
oneness in activities
tat ucyate
it is called.

My dear Yudhisthira (Partha), when all the activities one performs with his mind, words and body are dedicated directly to the service of the Supreme Personality of Godhead, one reaches oneness of activities, called kriyadvaita.