Reference for Bava Batra 231:9

ומדר' יהושע בן לוי הוא דאמר תלמיד רבי יוחנן אמר בן

and Rab Judah said in the name of Rab [that this means], 'he who goes [from the world] without [leaving] male children'?<span class="x" onmousemove="('comment',' If, then, R. Joshua said that such a person was not God-fearing, would he have gone to visit his house of mourning? ');">¹⁵</span> — But [it must be] R. Joshua b. Levi who said, 'a disciple'. Since, however, it is R. Joshua b. Levi who said 'a disciple', R. Johanan must have said, 'a son', a contradiction [then arises again<span class="x" onmousemove="('comment',' V. n. 6. ');">¹⁶</span>

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