Issur Veheter Ha'aruch
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Issur v'Heter Ha'aroch (known in short as O"H or Aroch) is a fifteenth-century book on the laws of prohibition and permission, particularly dietary laws.[1] The author wrote the book according to teachings he received from the R. Shalom b. Isaac of Wiener Neustadt., the teacher of the Yaakov ben Moshe Levi Moelin (Maharil).
There are two versions of the book. The manuscript version of the book differs from the printed version, which was apparently printed based on a different manuscript. Several times, rulings from the book were cited in the words of the Rema[clarification needed] that are not found in the printed version, and sometimes they are found but with a different meaning. The Rema himself noted the difference between the two versions of the book.