Reference for Zevachim 98:24

דבר הלמד מהיקש חוזר ומלמד בקל וחומר

For if were so [that we did rule thus], let 'northward' not be said in connection with a guilt-offering, and it could be inferred from sin-offerings by the gezerah shawah of 'it is most holy'.<span class="x" onmousemove="('comment',' Which is stated of both the sin-offering (Lev. VI, 18) and the guilt-offering (VII, 1) .');">³⁷</span> Surely then its purpose is to teach that that which is learnt by a hekkesh does not in turn teach through a gezerah shawah.<span class="x" onmousemove="('comment',' For in fact the rule that what is learnt by a hekkesh cannot in turn teach by a hekkesh applies to sacrifices only, and it is now shewn that it cannot teach in turn through a gezerah shawah either. Whereas the passage quoted referred to a different subject, viz., leprosy, and there what is learnt through a hekkesh can teach in turn even through a hekkesh.');">³⁸</span> But perhaps [we do not learn it there] because one can refute it: as for a sin-offering, [it requires north] because it makes atonement for those who are liable to kareth? - A superfluous 'most holy' is written.<span class="x" onmousemove="('comment',' In Num. XVIII, 9. Since this is superfluous, a gezerah shawah could be learnt even through the guilt-offering is dissimilar from the sin-offering. The fact that we do not do so proves that what is learnt by a hekkesh does not, in the case of sacrifices, teach in turn by a gezerah shawah.');">³⁹</span> That which is learnt through a hekkesh teaches in turn by a kal wa-homer.<span class="x" onmousemove="('comment',' V. Glos.');">⁴⁰</span>

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