Halakhah for Sanhedrin 90:14
א"ל מר קשישא בריה דרב חסדא לרב אשי ומי לא בעינן קרא כדכתיב והתנן היה אחד מהן גידם או אילם או חיגר או סומא או חרש אינו נעשה בן סורר ומורה
— Because the references to a murderer, and the 'avenger of blood' are two verses written with the same object, and the teaching of two such verses does not extend to anything else.<span class="x" onmousemove="('comment',' V. p. 458, n. 9. ');"><sup>26</sup></span> 'A murderer', as has just been stated. And what is the reference to the 'avenger of blood'? — It has been taught: The avenger of blood shall himself put the murderer to death;<span class="x" onmousemove="('comment',' Num. XXXV, 19, referring to wilful murder. Rashi's interpretation that it refers to accidental homicide where the murderer was found outside the city of refuge is difficult. V. Mishneh Lemelek on Yad, Rozeah I, 2. ');"><sup>27</sup></span>