Reference for Menachot 111:9

מה לבן צאן שכן קבע לו כלי

now I might have thought that it is the same here [with regard to the slaughtering], Scripture therefore stated 'it', signifying that 'it' must be on the north side but the slaughterer need not sta on the north side!<span class="x" onmousemove="('comment',' So that the term 'it', stated in Lev. IV, 24, has not been satisfactorily interpreted.');">¹²</span> - Rather [then interpret it thus]: 'It' must be on the north side but [the killing of] a bird-offering need not be on the north side.

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