Then Jesus said to his disciples, "I tell you the truth, it is hard for a rich man to enter the kingdom of heaven. Again I tell you, it is easier for a camel to go through the eye of a needle than for a rich man to enter the kingdom of God."
The “eye of the needle” being the door in the great gates of the city walls. Not an impossible task if you have a good camel. But not one you want to try after a few drinks on a Saturday night.