Reference for Bava Batra 41:1

סיפא אתאן לתינוקות של בית רבן ומתקנת יהושע בן גמלא ואילך

the concluding words refer to school children, from the time of the regulation of Joshua b. Gamala,<span class="x" onmousemove="('comment',' A High Priest in the decade before the destruction of the Temple. ');">¹</span>

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