Reference for Bekhorot 12:52

למה נשנו בבהמה מפני השסועה ובעופות מפני הראה

But [the object of these repetitions quoted] is really as was taught: Why is there a repetition [of the clean and unclean] ani mals?<span class="x" onmousemove="('comment',' In Leviticus and Deuteronomy.');">³¹</span>

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