Reference for Chullin 226:31

איסור חל על איסור ומאן דאמר אינו לוקה קסבר

Shall we say that they differ in this: he who says he incurs stripes maintains that a prohibition can be superimposed upon an existing prohibition, and he who says he does not incur stripes maintains that a prohibition cannot be superimposed upon an existing prohibition? - No.

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