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 theMessenger of Allah, may Allah bless him and grant him peace, usedtosay, "No, by the Overturner of hearts." Translation Not Available

Book Ref: Muwatta Imam Malik Book 22 Hadith 1028
Web Ref:  Muwatta Imam Malik Book 22 Hadith 15