Bg 4.23

gata-saṅgasya muktasya
jñānāvasthita-cetasaḥ
yajñāyācarataḥ karma
samagraṁ pravilīyate

Synonyms: 

gata–saṅgasya — of one unattached to the modes of material nature; muktasya — of the liberated; jñāna–avasthita— situated in transcendence; cetasaḥ — whose wisdom; yajñāya — for the sake of Yajña (Kṛṣṇa); ācarataḥ — acting; karma — work; samagram — in total; pravilīyate — merges entirely.

Translation: 

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.

 

In this verse Krishna concludes description of Karma Yoga

gata-saṅgasya muktasya – Sanga means attachment, gata sanga means whose attachment has gone away, muktasya – > this person is liberated.

jñānāvasthita-cetasaḥ -> Such a person’s consciousness is situated in knowledge.

yajñāyācarataḥ karma -> such a person acts for yajna

samagraṁ pravilīyate -> In totality that person’s karma will merge, it is significant that person will not merge but that person’s work will merge.

His work will become transcendental.

In this verse, yajñāyācarataḥ karma is very significant, Krishna is referred as principal of Yajna in 3.9 where he says work for the purpose of Yajna then you will not be bound, he has talked about whole system of Yajna from 3.9 to 3.16, so Yajna is not just fire sacrifice Yajna is selfless sacrifice. When the person will act in the mode of Yajna, then the person will be free from bondage. This word yajñāyācarataḥ karma will be expanded from 4.24 to 4.33