It's likely you are misremembering or mishearing a similar idiom, such as:
* "Fools rush in where angels fear to tread." This means that foolish people are often reckless and act without thinking, while wise people are more cautious.
* "The bigger they are, the harder they fall." This means that powerful or influential people are more vulnerable to failure.
* "Only fools rush in." This is a similar meaning to "fools rush in where angels fear to tread." It implies that people who are hasty and impulsive are likely to make mistakes.
It's important to be aware of the correct idioms and their meanings to avoid confusion. If you can provide more context, I may be able to help you figure out what idiom you're trying to remember.