Sunan Ibn Majah, Volume 3, Book 10, Hadith 2017 (DarusSalam) ⓘ
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?"
حَدَّثَنَا مُحَمَّدُ بْنُ بَشَّارٍ، حَدَّثَنَا مُؤَمَّلٌ، حَدَّثَنَا سُفْيَانُ، عَنْ أَبِي إِسْحَاقَ، عَنْ أَبِي بُرْدَةَ، عَنْ أَبِي مُوسَى، قَالَ قَالَ رَسُولُ اللَّهِ ـ صلى الله عليه وسلم ـ " مَا بَالُ أَقْوَامٍ يَلْعَبُونَ بِحُدُودِ اللَّهِ يَقُولُ أَحَدُهُمْ قَدْ طَلَّقْتُكِ قَدْ رَاجَعْتُكِ . قَدْ طَلَّقْتُكِ " .
also referenced under: Hadith 2017 (Reference) & Book 10, Hadith 2095 (In-Book)