Reference for Arakhin 18:6

מיתיבי

An objection was raised: The Feast of Weeks can fall only on the day of the waving,<span class="x" onmousemove="('comment',' The second day of Passover (v. Lev. XXIII, 10-12) i.e., on the same day of the week as the second day of Passover. The fifty days are counted from the sixteenth of Nisan to the first of Shabuoth. Hence the fiftieth day must fall upon the same week-day as the first, the day of the waving.');">³</span>

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