Reference for Chullin 3:4

אמר ליה רב אחא בריה דרבא לרב אשי

<big><b>GEMARA: </b></big>The expression ALL MAY SLAUGHTER [implies a right] in the first instance, yet the expression AND THEIR SLAUGHTERING IS VALID [implies merely a sanction] after the act!<span class="x" onmousemove="('comment',' The expressions are apparently contradictory, for whereas in the former a direct permission is granted, in the latter it is only after the act that the slaughtering is considered valid. This contradiction is not attempted to be answered until p. 3 infra; meanwhile R. Aha questions the soundness of the implications.');">²</span>

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