One of the zemirot traditionally sung on Shabbat begins with the words “ki eshmera Shabbat,” meaning “for I will keep Shabbat.” This poem was composed by Rabbi Avraham ibn Ezra (1089 – ca. 1167), a Spanish astronomer and mathematician, grammarian and biblical commentator, and of course poet.

The poem is an acrostic, meaning that the first letter of the five stanzas spell out the Hebrew name Avraham, indicating Ibn Ezra’s authorship.


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