One might wonder why God sent to the Israelites specifically so many Prophets (some sources say 70 prophets over the history of mankind).
One might ask, why not just send them one prophet and they follow him and that's it?! they were the chosen ones, so why so many?
Think of it this way...
When you have a body that is ill, you call a doctor to cure it. When the body is full of all sorts of illnesses, you need a lot of doctors!
- Sheikh Khalid El Gindy