 The commentary in the first edition of the series drew mainly upon classical Jewish sources (see below), but also drew upon the best of early-to-mid 20th century Bible scholarship, including the work of Christian expositors.The "Soncino Chumash", covering the Torah and Haftaras, first published in 1947 and frequently reprinted has only the views of the most important medieval Jewish commentators, such as Abraham ibn Ezra, Rashi, Rashbam, Ramban, Sforno, Radak, and Ralbag (Gersonides), but no modern or Christian source references, so as not to duplicate the book "The Pentateuch and Haftarahs" edited by Chief Rabbi Joseph H. Hertz, also published by the Soncino Press.A second edition of all books other than the "Soncino Chumash" appeared in the 1990s, edited by Rabbi Abraham J. Rosenberg, (a disciple of Rabbi Moshe Feinstein) who had previously done a Bible commentary for Judaica Press and a Mishnah commentary for Artscroll.