Yoshon

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Yoshon is a concept within Kashrut, the dietary regulations of Judaism. The word Yoshon literally means "old" and refers to the prohibition contained in the Torah (Leviticus 23:14) of eating from the new crops of certain grains (Chodosh) before the Omer offering from the new harvest was brought to the Temple on the second day of Passover. This marked the beginning of Sefirat Ha'omer. This prohibition only applied to the five classical grains of Judaism: Wheat, Barley, Oats, Spelt and Rye. Since there is no Omer offering in post-Temple times, the second day of Passover itself marks the end of the prohibiton against eating from the new grains.