Reference for Shabbat 220:7
והאמר ר' חייא בר אבא אמר ר' יוחנן
A certain Arab suffered with it. Said he to a gardener, Take my robe and give me some leeks from the wastes of the valley.<span class="x" onmousemove="('comment',' Or, as Rash. V. preceding note. ');"><sup>12</sup></span> He gave them to him [and] he ate them. Then he requested, Lend me your robe and I will sleep in it. He singed it, wrapped himself therein and slept. As he became heated through and got up, it fell away from him bit by bit.<span class="x" onmousemove="('comment',' From the feverish heat of the sleeper. ');"><sup>13</sup></span> 'For jaundice two [thirds thereof] with beer, and he becomes impotent.' But is this permitted? Surely it was taught: How do we know that the castration of a man is forbidden? From the verse, neither shall ye do thus in your land:<span class="x" onmousemove="('comment',' Lev. XXII, 24 v. preceding part of the verse. ');"><sup>14</sup></span> [this means], ye shall not do [thus] to yourselves: the words of R. Hanina! — That is only if he intends [it so], but here it is automatic. For R. Johanan said: If one wishes to castrate a cock, let him cut off its crest, and it is automatically castrated.<span class="x" onmousemove="('comment',' Thus direct castration only is prohibited, but not indirect, and the same applies here. ');"><sup>15</sup></span> But R. Ashi said: There it suffers from conceit?<span class="x" onmousemove="('comment',' It grieves that its crest is removed add refuses to copulate, but actually it is not castrated. ');"><sup>16</sup></span> Rather [the reference here is to] one who is [already] a castrate.<span class="x" onmousemove="('comment',' Who suffers from jaundice. ');"><sup>17</sup></span> But R. Hiyya b. Abba said in R. Johanan's name: