Verse 40

असंसक्तमकर्तेव कुर्वदेव मनो विदुः ।न कर्मफलभोक्तृत्वमसक्तं प्रतिपद्यते

In plain words

The unattached mind, though acting, is known as if a non-agent; the unattached does not come to be the enjoyer of the fruit of action.