16. Oaths and Vows
١٦۔ كِتَابُ الْأَيْمَانِ وَالنُّذُورِ
"The oath by which the Messenger of Allah used to swear was: 'No, by the Controller of the hearts.'" (Using translation from Nasāʾī 3761)
كَانَتْ «يَمِينٌ يَحْلِفُ عَلَيْهَا النَّبِيُّ ﷺ لَا وَمُقَلِّبِ الْقُلُوبِ»