Reference for Chullin 211:4

מים הראשונים האכילו בשר חזיר אחרונים הוציאו את האשה מבעלה

The omission to wash the hands before the meal caused one to eat swine's flesh,<span class="x" onmousemove="('comment',' A person once entered an inn and sat down to the table without first washing his hands. He was taken for a non-Jew and was served with swine's flesh.');">¹</span>

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