can be used as maror and the circumstances under which they may be eaten, and means to prevent substances becoming leaven during the festival. Chapter 3 lists various foods regarded as cḥametẓ, and which are not chametz themselves but contain leaven and for which a person failing to destroy them is guilty of transgressing the Biblical prohibitions, the search for leaven and its removal when the eve of Passover occurs on a Sabbath, cases in which travelers, who have set out on a journey and remember that they had not destroyed leavened food at home must return to do so; and by association, cases in which a pilgrims returning home from Jerusalem, discovers that they are carrying sacrificial meat, must go back to burn it at the Temple in Jerusalem. Chapter 4 begins with the statement that refraining from work on the eve of Passover depends on local custom (minhag) and discusses the strength of local customs in making and determining law; it then digresses to discuss various laws which depend on local customs and the binding force of customs in several different matters, and references practices of which the Rabbis did not approve and the extent to which they were able to stop them. Chapter 5 begins the discussion of the Passover sacrifice and other aspects of the sacrificial service at the Temple in Jerusalem, including the timing of the daily sacrifice (tamid) on the eve of Passover, and time for the sacrifice of the Passover sacrifice and circumstances which disqualify a lamb for use as the Passover sacrifice; it continues to describe the ceremonies in the Temple accompanying the slaughtering of the Passover sacrifice, the rows of priests, the accompanying music, and the three groups of the people who are required to recite the "Hallel" and finally, the manner of slaughtering the sacrifice when the eve o Passover falls on a Sabbath, and further preparation of the paschal lamb. Chapter 6 continues to discuss the sacrificial arrangement when Passover falls on a Sabbath, and with related issues such as when another animal must be sacrificed together with the paschal lamb, animals used for this sacrifice, and cases in which slaughtering the Passover sacrifice on the Sabbath is forbidden. Chapter 7 begins with the methods for roasting the Passover sacrifice, and examines problems regarding ritual impurity (tumah) affecting a person participating in the sacrifices, including those sacrifices which a