Is it true that there is a Jewish custom not to eat after animals (even if not mius issue (ie the person eating does not know))
ie if a rat ate a piece of a fruit I can't just cut off that part and eat the rest
If yes, what is the source?
Talmud Tractate Horayos 13b - "Eating something that a mouse (rat) or cat nibbled on, causes one to forget their learning"
So, the whole piece is discarded.