Reference for Yevamot 203:3
אמר רבה אמר רב כהנא אמר רב אם יבא אליהו ויאמר חולצין במנעל שומעין לו אין חולצין בסנדל אין שומעין לו שכבר נהגו העם בסנדל
mother was an Israelitish woman he may sit in judgment even on an Israelite.<span class="x" onmousemove="('comment',' Cf. supra n. 1. ');"><sup>5</sup></span> In respect of <i>halizah</i>, however, [no man is eligible as judge] unless both his father and his mother were Israelites for it is said, And his name shall be called in Israel.<span class="x" onmousemove="('comment',' Deut. XXV, 10, emphasis on the last word. ');"><sup>6</sup></span> Rabbah stated in the name of R. Kahana in the name of Rab: If Elijah should come and declare that <i>halizah</i> may be performed with a foot-covering shoe,<span class="x" onmousemove="('comment',' V. supra p. 694, n. 2. ');"><sup>7</sup></span>