Jewish Law Warns of 'Bitter Plague' Danger During Three Weeks Leading to Tisha B'Av

The period between the 17th of Tammuz and Tisha B'Av, known as Bein HaMetzarim or the Three Weeks, is marked in Jewish tradition by a spiritual danger called the "Katav Mariri" or "Bitter Plague." This concept appears in the Torah, Talmud, Midrash, and codified Jewish law, warning of a harmful spiritual force active during midday hours in this time of mourning for the destruction of the Temple.

The earliest mention is in Deuteronomy 32:24, describing "Katav Mariri" as a deadly force associated with bitterness and plague. Commentators like Ramban and Rashi interpret it as either a plague-like air or demonic entities active at midday. The Talmud (Pesachim 111b) clarifies there are two such harmful forces, one before and one after midday, each with distinct appearances and times of influence. The Midrash and later mystical writings describe Katav Mariri as a spherical, spinning entity that dominates the time between sun and shade, roughly from late morning to mid-afternoon.

Jewish legal authorities, including Rabbi Yosef Karo in the Shulchan Aruch, rule that during these hours from the 17th of Tammuz until Tisha B'Av, one should avoid walking alone outside the city and refrain from striking students, as the spiritual danger is heightened. The Mishnah Berurah specifies these hours as approximately 11 a.m. to 4 p.m. in summer in Israel. The prohibition is not about literal darkness but about the transitional time between full sun and shade, symbolizing a spiritual gray zone.

Kabbalistic sources from the writings of the Ari (Rabbi Isaac Luria) emphasize that the way to counteract this harmful influence is not direct confrontation but through increasing mercy, prayer, and mourning for the Temple's destruction, especially after midday. This includes customs such as reciting the Tikkun Rachel prayer after midday and refraining from new fruits or garments to avoid the blessing of "Shehecheyanu." These practices aim to sweeten the harsh divine judgments believed to be stronger during this period.

The article highlights that the spiritual danger of Katav Mariri is linked metaphorically to human emotions like bitterness and anger, which can cause people to lose control during these long summer days. The traditional mourning customs and halachic restrictions serve both as protection and as a call for introspection and repentance. Ultimately, those who mourn Jerusalem sincerely during these days are promised to share in its future joy and redemption.