Reference for Zevachim 20:27

ההוא אותה לאו דוקא דהא שייר פסח

[Let him say to him: The reason is] because it [the blood] requires four applications? - [R'Eliezer holds] as R'Ishmael, who maintains: All blood<span class="x" onmousemove="('comment',' The blood of all sacrifices,');">¹⁵</span>

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