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)
English reference (IT): Vol. 3, Book 10, Hadith 2017 (IT)
Arabic reference (IT): Book 10, Hadith 2095 (IT)