Karma Yoga — Action Without Attachment
The Gita's core teaching on selfless action: treat outcomes with equanimity, then act without clinging to the fruit of what you do.
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BG 2.38
Taking as equal pleasure and pain, gain and loss, victory and defeat, gird thee for the battle; thus thou shalt not incur sin.
BG 2.47
Thy business is with the action only, never with its fruits; so let not the fruit of action be thy motive, nor be thou to inaction attached.
BG 2.48
Perform action, O Dhananjaya, dwelling in union with the divine, renouncing attachments and balanced evenly in success and failure: equilibrium is called yoga.