Bg 4.23

gata-sangasya muktasya
jnanavasthita-cetasah
yajnayacaratah karma
samagram praviliyate

Word for word: 
gata-sangasya — of one unattached to the modes of material nature; muktasya — of the liberated; jnana-avasthita — situated in transcendence; cetasah — whose wisdom; yajnaya — for the sake of Yajna (Krishna); acaratah — acting; karma — work; samagram — in total; praviliyate — merges entirely.

Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
The work of a man who is unattached to the modes of material nature and who is fully situated in transcendental knowledge merges entirely into transcendence.

Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Becoming fully Krishna conscious, one is freed from all dualities and thus is free from the contaminations of the material modes. He can become liberated because he knows his constitutional position in relationship with Krishna, and thus his mind cannot be drawn from Krishna consciousness. Consequently, whatever he does, he does for Krishna, who is the primeval Visnu. Therefore, all his works are technically sacrifices because sacrifice aims at satisfying the Supreme Person, Visnu, Krishna. The resultant reactions to all such work certainly merge into transcendence, and one does not suffer material effects.