Several weeks of Sefirat HaOmer—until the 33rd day (“Lag BaOmer”)—are observed as a period of semi-mourning. It is customary to avoid haircuts, weddings, and other celebratory events. While these specific customs developed in the medieval period, they are rooted in an ancient and tragic tradition.

The most well-known explanation is a Talmudic legend (Yevamot 62b) which states that 24,000........

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