Reference for Shabbat 294:17
ואין מחזירין את השבר: אמר רבי חנא בגדתאה אמר שמואל
and do not rely on thine own understanding.<span class="x" onmousemove="('comment',' V. Ab. IV, 14. ');"><sup>30</sup></span> A Tanna taught: His name was not R. Nehorai but R. Nehemiah; whilst others state, his name was R. Eleazar b. 'Arak, and why was he called R. Nehorai? Because he enlightened [manhir] the eyes of the Sages in <i>halachah</i>.<span class="x" onmousemove="('comment',' If R. Nehorai was identical with R. Eleazar b. 'Arak, his statement was thus a result of personal experience. ');"><sup>31</sup></span> BUT [ONE MAY] NOT SCRAPE. Our Rabbis taught: One may not scrape with a strigil on the Sabbath. R. Simeon b. Gamaliel said: If one's feet are soiled with clay and dirt he may scrape them off in the usual way, without fear. R. Samuel b. Judah's mother made him a silver strigil. YOU MAY NOT GO DOWN TO A WRESTLING GROUND. What is the reason? Because of sinking [in the clay soil].<span class="x" onmousemove="('comment',' This makes walking a labour (Jast.). Rashi: the clay of that river (v. n. on Mishnah) is slippery, and so one may fall into the water, saturate his garments, and then ring them out. R. Han.: one may easily sink into the soft mud, thus giving many people the labour of hauling him out. ');"><sup>32</sup></span> ONE MAY NOT INDUCE VOMITING ON THE SABBATH. Rabbah b. Bar Hanah said in R. Johanan's name: They learnt this only [when it Is effected] by a drug, but it may be done by hand<span class="x" onmousemove="('comment',' By thrusting the finger down the throat. ');"><sup>33</sup></span> It was taught, R. Nehemiah said: It is forbidden even during the week, because of the waste of food. OR STRAIGHTEN AN INFANT['S LIMBS]. Rabbah b. Bar Hanah said in R. Johanan's name: To swaddle an infant on the Sabbath is permitted. But we learnt: YOU MAY NOT STRAIGHTEN?<span class="x" onmousemove="('comment',' And that is the purpose of swaddling. ');"><sup>34</sup></span> There it refers to the spinal vertebrae, which appears as building.<span class="x" onmousemove="('comment',' If one is dislocated it may not be reset. ');"><sup>35</sup></span> ONE MAY NOT RESET A BROKEN BONE. R. Hana of Bagdad said in Samuel's name: