Arabic hadith text
وَحَدَّثَنِي عَنْ مَالِكٍ، أَنَّهُ بَلَغَهُ أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم كَانَ يَقُولُ ‏"‏ لاَ وَمُقَلِّبِ الْقُلُوبِ ‏"‏ ‏.‏
Translation

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."