Reference for Chullin 281:29

סלקא דעתך הואיל ואמר מר

there is now [after the transgression of the law] not even a positive precept!<span class="x" onmousemove="('comment',' It, therefore, cannot be suggested that the man had transgressed the law and taken the dam, for then according to R. Judah it may be used for all purposes.');"><sup>21</sup></span>