Reference for Pesachim 38:10

אלא רישא דוקא וסיפא לאו דוקא ולאפוקי גזייתא

The [above] text [states]: R'Eleazar and R'Jose son of R'Hanina, - one said: They did not decree [uncleanness] for doubtful saliva in Jerusalem; while the other said: They did not decree [uncleanness] for doubtful utensils in Jerusalem.' [But] we have learned [about] saliva, [and] we have learned [about] utensils?<span class="x" onmousemove="('comment',' What do they add?');">¹³</span>

Jastrow