Reference for Kiddushin 163:13
דרש בר קפרא לעולם ילמד אדם את בנו אומנות נקיה וקלה מאי היא אמר רב יהודה
has a conceited spirit, and leans back<span class="x" onmousemove="('comment',' Lit., 'suspends himself.');"><sup>30</sup></span> when sitting, has a grudging eye and an evil eye;<span class="x" onmousemove="('comment',' He is miserly, and casts an evil eye upon people, so that they should need his services.');"><sup>31</sup></span> he eats much and excretes little;<span class="x" onmousemove="('comment',' [Because he joins his patients at the meals which follow the operation, and which must be the best food.]');"><sup>32</sup></span> and he is suspected of adultery, robbery<span class="x" onmousemove="('comment',' [His women patients rob their husbands in order to pay him for his services.]');"><sup>33</sup></span> and bloodshed.<span class="x" onmousemove="('comment',' [By drawing off too much blood.]');"><sup>34</sup></span> Bar Kappara taught: One should always teach his son a clean and easy craft. What is it? - Said Rab Judah: