Commentary for Chullin 209:53
מים ראשונים מצוה ואחרונים חובה
Others read: The last washing may not be performed over the ground.
Rashi on Chullin
It is forbidden to eat cheese - Because meat exudes fat that stays in the mouth and the taste stays in the mouth.
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Tosafot on Chullin
"At the next meal I'll eat": Not just at the meal that is customary - one in the morning and one in the evening - rather even immediately, if you clear the table and make the concluding blessing, it's permissible, since the Rabbi's didn't differentiate.
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