It’s “the eye of the needle”. It was a very narrow gate into Jerusalem, which camels had difficulty traversing.
> The "Eye of the Needle" has been claimed to be a gate in Jerusalem, which opened after the main gate was closed at night. A camel could only pass through this smaller gate if it was stooped and had its baggage removed. This story has been put forth since at least the 15th century, and possibly as far back as the 9th century. However, there is no widely accepted evidence for the existence of such a gate.[7][8]
These are things you can't take to heaven. These are things you should not covet. This and many other of Jesus's teaching demonstrate that to be holy and good is to focus not on the material, but on helping your fellow man. There's nothing saying you will get barred from heaven if you're rich. But there's plenty that says you should give away your wealth and spend all your time helping others. You know, kinda like what Jesus did...
The problem with much of mainstream American Christianity is that it tries to reconcile the greed and amorality of Capitalist wealth accumulation with its own teachings and they are fundamentally irreconcilable. Or, if you want, by its own scripture:
“No one can serve two masters: Either he will hate the one and love the other, or he will be devoted to the one and despise the other. You cannot serve both God and money.”
More reflection is required for a deeper understanding.