Pretty close here...
"The eye of a needle" is scripture quoted by Jesus recorded in the synoptic gospels:
I don't want to risk derailing the thread or sending it to PRSI, so I'll try to keep this concise. That verse is taken from Mark 10, the story of the rich young ruler. The message from that passage is that you can't earn or buy your way into heaven. Nobody can, rich or poor. That man claimed to have followed every one of the ten commandments his entire life -- he was trying to say that he was a perfect person. Jesus challenged him about the one material vice he was still hanging on to, saying "well, if you claim to be so good, give away all your possessions then". He wouldn't do it, and walked away. Jesus essentially said "See? Nobody's perfect."
There have been plenty of Christians that have made good business decisions and done very well for themselves financially. Consider the Parable of the Talents, which praises a man who invests wisely the resources given to him by God, but criticizes the man who hoards it or squanders it. What would be considered sinful is if you don't help out your fellow man when you can, put your love of money before anything else, or if you refuse to give it up should God call you to do something else. But being wealthy is not, in itself, a bad thing.