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For practical advice you'll need to ask your own rabbi, particularly as some of our sources disagree with each other. Here's what I found: It appears to depend on what specifically the books are:...
#1: Initial revision
For practical advice you'll need to ask your own rabbi, particularly as some of our sources disagree with each other. Here's what I found: It appears to depend on what specifically the books are: - A *sefer torah* written by a heretic is burned (Rambam Laws of Tefilin, Mezuzah, and Sefer Torah 1:13). - For a Christian bible that contains the Tanakh, [Halachically Speaking: Shaimos](https://www.theyeshivaworld.com/news/headlines-breaking-stories/226909/halachically-speaking-the-halachos-of-shaimos.html) has this to say: > Book of the Missionaries > Many poskim maintain that a “book” of the missionaries which may contain a t’nach may be burnt and one should not keep this in his possessions.[103] Others maintain that one should place this sefer in shaimos.[104] Those in favor of burning (note 103) are: Igros Moshe Y.D. 1:172, Yaskil Avdi Y.D. 7:20, Maharam Shik O.C. 66. Those who say it should be buried (note 104) are: Avnei Yushfei 1:204, Emes L’Yaakov Y.D. 281:footnote 199, Ve’alu Lo Yeibol 2:page 121:121, Yugel Yaakov page 251, Divrei Chachumim Y.D. 100:5. [Din Online](https://dinonline.org/2021/06/21/names-of-hashem-and-geniza/) (h/t rosends) also says it's controversial whether to burn it or bury it, and adds that if you bury it you should first deface it. He cites Maharam Shick O:CH 66, Igros Moshe Y:D 2-137, Avnei Yoshpe 1-204. - For a Christian "new testament" (sic), opinions differ. You can just throw it out according to Rabbi Shlomo Aviner as cited [in a comment here](https://judaism.codidact.com/comments/thread/2564#comment-8543) (on a question I asked here some years ago). On the other hand, Rabbi Ari Shvat [wrote in an ask-the-rabbi post](https://www.yeshiva.co/ask/6264) that it should be burned, citing Igrot Moshe, YD 172. I don't know which opinion is more popular. - Other Christian printed papers that have English names of God are treated like the Tanakh case, according to Din Online again (but with no named sources).
