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Rabbi Yitzhak Ginsburg
Ginsburg was detained for questioning days after the alleged author of the book, rabbi Yitzhak Shapira was arrested for inciting to violence. Shapira is also a rabbi at the Od Yosef Chai yeshiva.
The book, named "The King's Torah," deems the killing of non-Jews who threaten Israel as legal. "It is permissible to kill the Righteous among Nations even if they are not responsible for the threatening situation," the book says, adding: "If we kill a Gentile who has sinned or has violated one of the seven commandments - because we care about the commandments - there is nothing wrong with the murder."
Ginsburg, who recommended the book to his students, is a follower of Chabad. He has faced prosecution in the past for incitement to racism after having published a book insisting that there is no place for Arabs in the state of Israel. The charges were dropped after Ginsburg issued a clarification letter.
Ginsburg is a well known radical in his views on Israel's Arab public. The police declined to comment on the ongoing investigation against him.
The Od Yosef Chai yeshiva issued a letter on Thursday condemning the police, saying that in any other enlightened country it would be inconceivable to question such an admirable man as rabbi Ginsburg.