Hadith 17

Muwatta Malik

Book 22: Vows and Oaths
وَحَدَّثَنِي عَنْ مَالِكٍ، أَنَّهُ بَلَغَهُ أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم كَانَ يَقُولُ ‏ ‏ ‏.‏
"‏ لاَ وَمُقَلِّبِ الْقُلُوبِ ‏"
Yahya related to me from Malik that he had heard that the Messenger of Allah, may Allah bless him and grant him peace, used tosay, "No, by the Overturner of hearts."