Reference for Nedarim 81:8

רבה בר שילא אמרו ליה שכיב גברא גבוה הוה רכיב גירדונא זוטרא מטא תיתורא איסתויט שדייה וקא שכיב קרי על נפשיה למשפטיך עמדו היום

When Rabbi had studied his teaching in thirteen different interpretations, he taught R. Hiyya only seven of them. Eventually Rabbi fell sick [and forgot his learning]. Thereupon R. Hiyya restored to him the seven versions which he had taught him, but the other six were lost. Now, there was a certain fuller who had overheard Rabbi when he was studying them himself; so R. Hiyya went and learned them from the fuller, and then repeated these before Rabbi. When Rabbi met him, he said to him, 'Thou hast taught<span class="x" onmousemove="('comment',' Lit., 'made'. ');">⁶</span>

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