Reference for Bekhorot 115:18

במאי קמיפלגי ר"ע ובן עזאי

And the reason why he fixes the first of Siwan<span class="x" onmousemove="('comment',' And does not say fifteen days before Pentecost, in the same way as he mentions fifteen days before Passover as a period of tithing.');">¹¹</span>

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