It was narrated from 'Umar bin Khattab that: the Messenger of Allah divorced Hafsah then took her back.
It was narrated from Abu Musa that: the Messenger of Allah said: What is wrong with people who play with the limits imposed by Allah, and one of them says: I divorce you, I take you back, I divorce you?
It was narrated from 'Abdullah bin 'Umar that: the Messenger of Allah said: The most hated of permissible things to Allah is divorce.