Commentary for Zevachim 100:3

הניחא למאן דאית ליה דרב פפא אלא למאן דלית ליה דרב פפא מאי איכא למימר

Can that which is learnt by a gezerah shawah teach in turn by a kal wa-homer? - [It can, and we learn this by a] kal wa-homer: If [that which is learnt by] a hekkesh, which cannot teach by a hekkesh, as follows from either Raba's or Rabina's [proof], can teach by a kal wa-homer, which follows from what the school of R'Ishmael taught; then [what is learnt through] a gezerah shawah, which can [in turn] teach by a hekkesh, as follows from R'Papa, can surely teach [in turn] by a kal wa-homer! That is well according to him who accepts R'Papa's teaching; but what can be said on the view that rejects R'Papa's teaching? - Rather [this is the] kal wa-homer: if [what is learnt by] a hekkesh, which cannot [in turn] teach by a hekkesh, as follows either from Raba or from Rabina, can teach [in turn] by a kal wa-homer, which follows from what the school of R'Ishmael taught; then a gezerah shawah, which does teach by a gezerah shawah like itself, which follows from Rami B'Hama, can surely teach through a kal wa-homer.

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