Reference for Chullin 16:29

גזירה שמא יחתוך חלבים ואחר כך בשר

But why should he not use the same knife first for cutting meat and then for cutting fat? - It is forbidden to do so lest he cut with it the fat first and then the meat.<span class="x" onmousemove="('comment',' Without first removing the fat from the knife. 'Fat' throughout the whole of this passage means forbidden fat.');">¹⁴</span>

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