Study Guide Moed Katan 5 Pictures Today’s daf is sponsored by David and Mitzi Geffen in loving memory of Rabbanit Sara Hene Rabinowitz Geffen on her yahrzeit. “She and her husband Rav Tuvia Geffen, Rabbi of Shearith Israel in Atlanta, brought up their 8 children in a life of learning. Seven of her grandchildren live in Israel.” Today’s daf is sponsored by Talia Kirshenbaum in honor of Arielle Frankston Morris. “Thank you for encouraging and inspiring us to jump back on the daf yomi bandwagon for Masechet Megillah. Tizki le'Mitzvot!” Today’s daf is sponsored by Vered Wexler in loving memory of her grandmother, Morti Margret Renta Sara Bat Lilu. One can fix a water channel that is broken but can one dig a new one on chol hamoed if it is needed for the public? Rabbi Yaakov in the name of Rabbi Yochanan permits, however, a question is raised against him from a braita that clearly states that digging is not permitted. However, it is unclear if the braita is referring to a case where it is needed by the public or not.  There are different ways to read the braita. Can our Mishna provide support for Rabbi Yochanan as well? Where is the source in the Torah for the need to make a sign on a grave for kohanim to know not to pass over there? There are many different verses brought to answer this question. Places that have impurity that can be imparted by a tent need marking but not ones that only pass on impurity through touching or carrying. One cannot place markers on chol hamoed if it is clear to all there is a grave there. But if there is a doubt, such as overhanging trees and rocks, and a beit hapras, then markers can be put up on chol hamoed. What are the cases of overhanging trees and rocks and a beit hapras? There are three cases that can be considered a beit hapras. Rav Papa thinks that not all cases of a beit hapras require markers. Which one does not? Why?