Reference for Moed Katan 41:15

ת"ש אמר עולא חולץ ומניח אפי' מאה פעמים תניא נמי הכי יהודה בן תימא אומר חולץ ומניח אפי' מאה פעמים

But as to R'Joshua. surely it is written: [An the days of weeping in the mourning for Moses] were ended? - He may reply. The case of Moses was different; the mourning for him was [more] intense.

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