The Chapters on Expiation
11/1. Chapter:
The swearing of the Messenger of Allah (saws) by which he would take an oath
Sunan Ibn Majah
حَدَّثَنَا أَبُو إِسْحَاقَ الشَّافِعِيُّ، إِبْرَاهِيمُ بْنُ مُحَمَّدِ بْنِ الْعَبَّاسِ حَدَّثَنَا عَبْدُ اللَّهِ بْنُ رَجَاءٍ الْمَكِّيُّ، عَنْ عَبَّادِ بْنِ إِسْحَاقَ، عَنِ ابْنِ شِهَابٍ، عَنْ سَالِمٍ، عَنْ أَبِيهِ، قَالَ كَانَتْ أَكْثَرُ أَيْمَانِ رَسُولِ اللَّهِ ـ صلى الله عليه وسلم ـ " لاَ وَمُصَرِّفِ الْقُلُوبِ " .
It was narrated from Salim that his father said: "The swearing most frequently sworn by the Messenger of Allah (ﷺ) was: 'No, by the Controller of the hearts."'
Reference : Sunan Ibn Majah 2092In-book reference : Book 11, Hadith 3English translation : Vol. 3, Book 11, Hadith 2092