BG 3.19

Therefore, without being attached to the fruits of activities, one should act as a matter of duty, for by working without attachment one attains the Supreme.

3.19. Therefore, unattached always, you should perform action that is to be performed; for, the person, performing action without attachment, attains the Supreme.

3.19 Therefore do thy duty perfectly, without care for the results, for he who does his duty disinterestedly attains the Supreme.

3.17-19 Yas ca etc. upto purusah. However, for a person who rejoices in the Self and performs action simply as a [routine] business of organs of action, there is no difference between (his) action and nonaciton. That is why he inflicts punishment on, or does favour to, every being, not with desire for any gain for himself, but with a conviction that it a is thing that deserves to be performed. Therefore, just unattached, one should perform action that is to be performed.

3.19 Therefore, considering that work has to be performed with detachment, you perform it, considering yourself a non-agent. This will be declared in the words 'with detachment' and 'which ought to be done,' meaning that one attains the Supreme by Karma Yoga itself.

3.19 Since this is so, therefore, asaktah, remaining unattached; samacara, perform; satatam, always; karyam, the obligatory; daily karma, duty; hi, for; acaran, by performing; (one's) karma, duty; asaktah, without attachment, by doing work as a dedication to God; purusah, a person; apnoti, attains; param, the Highest, Liberation, through the purification of the mind. This is meaning. And (you should perform your duty) for the following reason also:

3.19 Therefore without attachment do your work which ought to be done. For, a man who works without attachment attains to the Supreme.

3.19 Therefore, remaining unattached, always perform the obligatory duty, for, by performing (one's) duty without attachment, a person attains the Highest.