3.19 So do your work, unattached Krishna speaks

तस्मादसक्तः सततं कार्यं कर्म समाचर
असक्तो ह्याचरन्कर्म परमाप्नोति पूरुषः

tasmād asaktaḥ satataṁ kāryaṁ karma samāchara
asakto hyācharan karma param āpnoti pūruṣhaḥ

So do the work that falls to you, always, without attachment. Acting unattached, a person reaches the highest.

Explanation

So: back to the instruction.

Do the work that falls to you, always, without attachment. Acting unattached, a person reaches the highest.

The exception in 3.17 has been stated and set aside, and the sentence resumes exactly where 3.8 left it. The Gita's core instruction never changes; what changes is the reason attached to it.

Word by word

tasmāt: therefore
asaktaḥ: without attachment
satatam: constantly
kāryam: duty
karma: action
samāchara: perform
asaktaḥ: unattached
hi: certainly
ācharan: performing
karma: work
param: the Supreme
āpnoti: attains
pūruṣhaḥ: a person