The Book of Heart-Melting Traditions (Kitab Al-Riqaq)
Muslim :: Book 36 : Hadith 6596
Usama b. Zaid reported that Allah's Messenger (way peace be upon him) said: I stood at the door of Paradise and I found that the overwhelming majority of those who entered therein was that of poor persons and the wealthy persons were detained to get into that. The denizens of Hell were commanded to get into Hell, and I stood upon the door of Fire and the majority amongst them who entered there was that of women.