Yes, it was Hippocrates, in his book "Bone Fractures". Published in the year 400 B.C.
I read this book, and it is such an eye opener. Not because of any interest in bone fractures, but because of the clear view of Hippocrates on fake specialists.
Basically he repeats: Use good and clean tools, and use proven methods. Great damage is done, by foolish methods, which only appear interesting.