The Sabbath Epistle of Rabbi Abraham Ibn Ezra (English and Hebrew Edition) – Link

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“The Sabbath Epistle (‘Iggeret haShabbat) is a treatise written by Rabbi Abraham Ibn Ezra in the year 1158 while he was residing in England. The impetus for his writing this treatise was a note by a Biblical exegete that the Torah’s “day” extended from one dawn to the following dawn. Ibn Ezra was appalled by this comment and composed an extensive letter in which he clarified the Torah’s definition of a day, a month, and a year. In so doing, Ibn Ezra also expounded on the meaning of some difficult verses of the Bible.”