Sahih Bukhari
Divine Will (Al-Qadar)
Volume: 008 / Book Number: 077 / Hadith Number: 598
Narrated Abu Huraira:
Allah's Apostle said, "No woman should ask for the divorce of her sister (Muslim) so as to take her place, but she should marry the man (without compelling him to divorce his other wife), for she will have nothing but what Allah has written for her."