Coveting the possessions of others, doing harm to others, and disbelief in the Vedas, are the three deeds done with the mind which should always be avoided.
अनभिघ्या परस्वेषु सर्वसत्त्वेषु सौहृदम्। कर्मणां फलमस्तीति त्रिविधं मनसा चरेत्॥