Reference for Chullin 226:32

אין איסור חל על איסור

All agree that a prohibition cannot be superimposed upon an existing prohibition; and [consequently] there is no dispute at all that for eating this he does not incur stripes.<span class="x" onmousemove="('comment',' For the prohibition of 'flesh in milk' cannot be superimposed upon the existing prohibition of forbidden fat.');">²²</span>

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