Reference for Zevachim 98:5

למה לי לאקשויי לחטאת למה לי לאקשויי לעולה

Why must it be likened to both a sin-offering and a guilt-offering? - Said Rabina, It is necessary: if it we likened to a sin-offering and were not likened to a guilt-offering I would say, Whence did we learn [that] a sin-offering [is slaughtered in the north]? from a burnt-offering: thus that which is learnt through a hekkesh in turn teaches through a hekkesh.<span class="x" onmousemove="('comment',' Therefore Scripture adds the burnt-offering, to shew that that is not so.');">⁹</span>

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