Camel through the eye of a needle
Here’s what it means
It is humanly impossible for a rich person who trusts riches to enter God’s kingdom; salvation requires God’s power.
Why the Bible says it this way
The writer deliberately uses very strong language to make an important point. The point is serious even though the wording is not meant literally.
A helpful detail: The ordinary camel and sewing-needle reading fits the deliberate impossibility and Jesus’ explanation. The popular “small gate” theory lacks solid historical support.