There are many interesting questions for the Samaritans that are difficult for them to answer. For example, eating from the Passover sacrifice according to the Torah can only be performed in ritual purity. Now since there is no purification process involving the red heifer for contact with dead bodies (tumas meys), how do they allow themselves the Passover sacrifice while at the same time claiming to follow the written Torah? Secondly, how did the idea of the division of the priesthood during the time of Eli develop among the Samaritans? Why specifically then?
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from the article: Ancient Samaritan sect marks Passover sacrifice near Nablus