Reference for Makkot 9:13

פשיטא מהו דתימא ליחוש לגמלא פרחא קמ"ל

Isn't this obvious? You might have thought... we would take into account [the possibility] that he had used an extremely fast method of transport [Lit. a flying camel]. This [Rava] comes to teach us [that we don't worry about that possibility].

Jastrow