It is explained otherwise; That at Jerusalem there was a certain gate, called, The needle’s eye, through which a camel could not pass, but on its bended knees, and after its burden had been taken off; and so the rich should not be able to pass along the narrow way that leads to life, till he had put off the burden of sin, and of riches, that is, ceasing to love them.
Reproduced in full. Translation: Oxford 1841 (Newman), public domain (Public domain).
Also cites: ap. Anselm