HILCHOT MECHIRAH
The Laws of Selling
These laws contain five mitzvot: one positive mitzvah and four negative mitzvot. They are:
a) The laws of buying and selling;
b) Not to cheat when buying and selling;
c) Not to cause discomfort through words;
d) Not to cheat a convert financially;
e) Not to cause a convert discomfort through words. These mitzvot are explained in the chapters that follow.