Reference for Chullin 202:13

אמר ליה רבא

and they sent word from there [Palestine] that the Day of Atonement of that year should be observed on a Sabbath.<span class="x" onmousemove="('comment',' Although that day was not the correct date of the Day of Atonement. Consequently any breach of the sanctity of that day can only be considered as a transgression of the Sabbath but not as a transgression of the Day of Atonement.');">¹⁰</span>

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