Bhagwad Gita
Chapter 5, Verse 12
युक्तः कर्मफलं त्यक्त्वा शान्तिमाप्नोति नैष्ठिकीम्।
अयुक्तः कामकारेण फले सक्तो निबध्यते।।5.12।।
The steadily devoted soul attains unadulterated peace because he offers the result of all activities to Me; whereas a person who is not in union with the Divine, who is greedy for the fruits of his labor, becomes entangled.