Reference for Sanhedrin 78:18

בשלמא למאן דאמר לשם שמים היינו דכתיב (מלכים ב ג, כז) ויהי קצף גדול על ישראל אלא למאן דאמר לשם ע"ז אמאי ויהי קצף

the gift of prophecy? — Because he hid a hundred prophets in caves, as it is written, For it was so when Jezebel cut off the prophets of the Lord that Obadiah took a hundred prophets and hid them, fifty in a cave.<span class="x" onmousemove="('comment',' Kings XVIII, 4. If the one cave was discovered the others might escape. ');">³⁰</span> Why just fifty? — R. Eleazar said: He learnt this lesson from Jacob,<span class="x" onmousemove="('comment',' Who divided his followers into camps. ');">³¹</span>

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