Police arrested on Thursday Rabbi Yosef Elitzur from Itzhar on suspicion of incitement to racism and violence and possession of a racist publication.
His arrest is part of an ongoing investigation into Rabbi Yitzhak Shapira's controversial book "Torat Hamelech," which presents an halachic perspective on violence against non-Jews.
Previously detained Rabbi Elitzur Hershkovitz was scheduled to be brought before the Rishon Lezion Magistrate's Court for a remand hearing later Thursday.
Dozens of rabbis, educators, public figures and right-wing activists attended on Wednesday a support rally for Rabbis Dov Lior and Yaakov Yosef, who refused to report for police questioning over their endorsement of the book.
The two, along with other rabbis and the author of the book, Rabbi Yitzhak Shapira, are being investigated on suspicion of incitement.
Rabbi Shapira, who was detained at the beginning of the month, wrote in his book, "When we encounter a gentile who has violated the Seven Laws of Noah and kill him out of concern for upholding the seven mitzvoth, no prohibition has been violated."
According to the rabbi, "Anywhere where the presence of a gentile poses a threat to Israel, it is permissible to kill him, even if it is a righteous gentile who is not responsible for the threatening situation."
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