It is widely believed to have been a reference to a particular gate into Jerusalem during biblical times. That doorway was literally called "Needle's Eye" and it was built like the eye of a needle and was so low that a camel could only pass through it if it entered kneeling and without baggage.
The lesson was that an eternal inheritance awaits those who unburden themselves of sin, and in particular, the things of this world.
Your chosen name alerted me after I read your scathing post earlier so I thought I'd point out that if you want to pass through this trial, perhaps you might consider the baggage you yourself are carrying before you pass such harsh judgment on someone else.
