Reference for Menachot 111:5

אלא אותו טעון צפון ואין השוחט עומד בצפון

then with regard to the requirement of laying on of hands Scripture should have been silent concerning it since it would have been included by virtue of the general principle. But [you would answer that] we may not derive [the regulations applicable, to] a temporary enactment<span class="x" onmousemove="('comment',' Sc. the offering of Nahshon's he-goat at the dedication of the altar.');">⁷</span>

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