A special letter published here in Haredim 10, signed by Maran HaGir HaG Edelstein, Rosh Yeshiva of Ponevezh, and Maran HaGir HaGir HaKanievsky, details the practices that yeshiva members must adhere to during the "between-the-days" of the month of Av.
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Under the title "For Torah rabbis, rabbis, teachers, and yeshiva students" - the Grach and the Graig write: "Now, with the spread of the virus in the world, it is obligatory for each and every one to be very careful not to be infected and not to harm others, HaShem, but for Torah rabbis, the obligation of utmost caution is due to the fact that the rabbis' authority depends on them, and according to the Shulchan Arba and the Rambam, in the Laws of Teachers (see Rambam), and unfortunately, there are Torah rabbis who have been canceled due to the illness of teachers and rabbis.

""And in general, the duty of caution is to avoid participating in events such as weddings, bar mitzvahs, etc. - except for the closest family members." The Grach and the Gag add: "And also not to be in beit midrash where there is no due caution. And in places of study (yeshivas and rabbis) one must act with extreme caution, so as not to cause God to nullify the Torah of the rabbis, and whoever is careful about this is indeed blessed, etc. "And now, after the 9th of Av until the 1st of Elul, even if one is not in the yeshiva, one must be careful not to travel, because in the past there were disasters due to travel. There is a need for rest, but not to throw off the yoke of Torah, because this is a very serious matter.".