Teaching on Fast Days
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Question
Hello, I teach in a Talmud Torah with a large class of 30 students, and fasting does not allow me to teach properly. Am I obligated to fast? The question pertains to the fasts of the 10th of Tevet, the Fast of Esther, and the 17th of Tammuz. Thank you very much, Yehuda
Answer
According to the instructions of our teacher, Rabbi, shlita:
Anyone who knows that if they do not exert themselves during the fast, they will not be considered ill, should rest so that they can fast.
Therefore, if you cannot fast due to work, you should refrain from teaching at that time and find a substitute.
If it is impossible to avoid working, begin the fast. If in the middle of the fast you weaken and are considered 'ill', you will be exempt from continuing the fast.
Source
Shulchan Aruch, Orach Chaim, Siman 550, סעיף 1
Everyone is obligated to fast on these four fasts, and it is forbidden to breach this rule.