פירוש על שמות 20:14

לא תחמוד, the object you covet should be considered by you as so utterly unattainable that you will not even begin to hatch schemes of how to acquire it. This is the promise made by G’d in Exodus 34,24 that none of our neighbours will covet our land while we are engaged in making the pilgrimages to Jerusalem. Once you begin to covet something belonging to someone else it is only a short step to committing robbery. (compare Joshua 7,21 where Achan ben Carmi who had become guilty of such robbery admitted that it all began with his coveting the items which he stole and hid.)