Chapter 1, Mishna 1
Why do we nullify chametz, leaven, in our homes at the time we search for it on the night before Passover begins? Can we nullify it after the Festival begins? What happens if we find flatbread so moldy we’re not sure if it’s chametz or matza? Why do we sometimes “follow the majority” and sometimes “follow the last?” We do we recite a blessing before performing a mitzvah? Why does the formula of this blessing sometimes refer to “doing” the mitzvah, and sometimes “concerning” the mitzvah? In what circumstances do we say the blessing after the mitzvah?