From this father (Ibn Umar) who said: "The Messenger of Allah ﷺ often would swear with this oath: 'No! By the Changer of the Hearts.'"  

كَثِيرًا مَا كَانَ رَسُولُ اللَّهِ ﷺ يَحْلِفُ بِهَذِهِ الْيَمِينِ لاَ وَمُقَلِّبِ الْقُلُوبِ