Sahih Bukhari
Wedlock, Marriage (Nikaah)
Volume: 007 / Book Number: 062 / Hadith Number: 113
Narrated Abu Huraira:
Allah's Apostle said, "The woman is like a rib; if you try to straighten her, she will break. So if you want to get benefit from her, do so while she still has some crookedness."